Biology essay papers

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For the last few decades, cloning was a fictitious idea that lay deep within the pages of some sci-fi novels. The very idea that cloning could one day become reality was thought to be a scientific impossibility by many experts but on one exhilarating day, what was thought to be "purely fiction" became reality. That fine day was February 22, 1997. A team from the Roslin Institute which was lead...
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Biology essays / Ozone In Medicine
Klyment Tan March 2, 1998 Ozone in Medicine: Modern Magic Bullet or Fatal Deception? Ozone may be one of the most misunderstood medical achievements of this century. In this essay, facts will be filtered from politics to find the answer to this question: Ozone-the modern magic bullet or fatal deception? First of all, what is ozone? As defined in the Encarta Encyclopedia: Ozone (Greek oze...
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Biology essays / Diabetes
DIABETES Diabetes is a chronic illness but it is not fatal. A chronic illness is classified as an illness with no cure and has symptoms that persist over a long period of time. Diabetes is not a fatal illness, except in a few rare and severe cases. It is one of the most common chronic illnesses that a person can get. About 16 million Americans have diabetes and diabetes is most common in Hispan...
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Biology essays / Rays
Rays are primarily slow-moving, bottom-dwelling fishes of the oceans, the rays are close relatives of the sharks. Both, including skates, belong to the same class of fish, Chondrichthyes-vertebrates whose skeleton is composed of cartilage, not true bone. The terms skate and ray are often used interchangeably. Both fishes belong to the taxonomic order Batoidei, but the skates are classified in the ...
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Biology essays / Bats
By Nick Carroll (I do not wish to remain anonymous; let my work benefit everyone!!) Note: I wrote this as a freshman. I do not know if it is any good. The information is accurate, though. Have Fun! ...
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Biology essays / Biometrics
It is my opinion that Biometrics is an idea that should not become a reality due to the lack of privacy and control over our own lives that it would create. If the government were to carry out with the plan of Biometrics then the world would become more of a paranoid place then it already is. The general public would be able to be tracked at any moment and all the infor...
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Biology essays / Spinal Cord Regeneration
Spinal Cord Regeneration Spinal cord injury can occur in many ways ranging from gunshot wounds, stab wounds and also bone displacement. These circumstances can lead to the death of neurons, and the demyelination of axons which causes some loss and damage to neurons. As Hudgins (1998) reports after a primary injury such as above, secondary injury occurs 30 minutes after and also that second...
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Biology essays / The Prairie Dog
The Prairie Dog Cynomys ludovicianus, known more commonly as the prairie dog, has more traditionally been viewed as the pariah of the prairie. However within the last year, attention has been drawn to these furry little rodents. They are extremely unpopular-¬Ěso much so that for decades the Federal Government has tried desperately to eliminate them. What the government doesn't know is that t...
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Biology essays / Biological Warfare
Biological Warfare The history of Biological Warfare(BW), like most topics, can be divided into 3 parts: Early History, Modern History, and what we call "The Now." The early history starts as far back as you can think and continues up to the start of the 20th century. The first recorded use of biological agents is the Romans using dead animals to foul the enemies water supply. This had th...
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Biology essays / Potatoe Piece Lab
Data: First Round Check Mass of Piece 1 After 10 minutes Mass of Piece 1 After 20 Minutes Mass of Piece 1 After 30 Minutes Mass of Piece 1 After 40 Minutes +60? Water 2.1 2.5 2.5 2.0 10? Water 2.1 2.4 2.2 2.1 Sugar Solute 2.1 2.2 2.3 2.2 Salt Solute 2.1 2.0 2.4 2.1 Room Temp. Water (C.) 2.1 1.9 2.2 2.3 First Round Check Mass of Piece 2 After 10 minutes Mass of Piece 2 After 20 Minutes...
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Although widely unknown to the American public, many of America's waterways are in extreme danger from something besides pollution. A new organism has been introduced that has the possibility to be deadlier than any pollution imaginable. This new threat is the zebra mussel (Dreissena polymorpha). A zebra mussel is a fresh water mussel that filters every bacteria in a water system until there is no...
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Sea Lamprey: A Great Lakes Invader Sea lampreys are aquatic vertebrates native to the Atlantic Ocean. Sea lampreys resemble eels, but unlike eels, they feed on large fish. They can live in both salt and fresh water. Sea lampreys, now found in all the Great Lakes, attach to fish with a sucking disk and sharp teeth. Sea lampreys feed on body fluids, often scarring and killing host fish. To...
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Biology essays / The Leaf Cutting Ant
Leaf-cutting Ants Grant Erickson One of the most little known species of ants in North America is the leaf-cutter ant. This is mainly because it lives in tropical environments and it is not aggressive to animals or humans if not disturbed. The leaf cutting ant is a social insect. Alone the ant is virtually helpless but with the colony it can be a thing feared by animal and human alike. The...
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The End Permian Mass Extinction Outline I. Introduction Think of a world which existed 290 million years ago. As you look out over the terran in front of you, you think that you are on an alien planet. You see volcanoes spewing ash and lava. Beside them is the ocean which is swarming with many different species of echinoderms, bryozoans and brachiopods. As you look down onto the sea floor y...
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Biology essays / Lupus
Lupus Lupus is an autoimmune disorder which means that the body's immune system is not functioning normal and it's attacking the normal tissue, instead of the bactieria and viruses or in other words the body's immune system is hurting itself. The body is just reacting to unknown stimilus and it makes too many antibodies, or proteins directed against body tissue. It's the complete opposit...
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Debates on Bioethics have been a central and key in society's thoughts on new and involved medical science, as it conflicts with our own predetermined morals and value judgements. The more advanced our medicine becomes the more we must question, how much should we know about each other, as well as how much should we know about ourselves? The presented case, that of Susan M., provides an interes...
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Biology essays / Hearing Loss
Hearing Loss Not more than a few decades ago deaf children would never learn to speak. They would be referred to as deaf mutes and people thought that the reason they had a hearing loss and couldn't speak was because their brain functioned wrong and they didn't know how to use their vocal cords. Scientific research and technology have proven that these two theories are wrong and that people wi...
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Biology essays / Bacteria
Bacteria Bacteria is a simple organism that consist of one cell. They are among the smallest living thing on earth. Most bacteria measures from about 0.3 to 2.0 microns in diameter, and can only be seen through a microscope. Scientist classify bacteria according to shape. Cocci are round and sometimes linked together. Bacilli look like rods, and Vibrios resembles bent rods. There are two...
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Definitions: Cell Wall A structure made of cellulose that is, in the plant, responsible for many tasks. Firstly, it maintains the shape of the cell, and secondly it protects the cell from external forces. It also serves as a connector between the cell in question and its neighboring cells. Cell Membrane A thin and flexible membrane used to hold the cell together (the example given in the t...
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1. In order to grow and survive an organism must metabolize. In order to metabolize, an organism must have access to nutrients and O2 at the cellular level. Within the kingdom Animalia, there are several solutions to the problem of delivery of said nutrients and O2. Discuss, in a written format, the various internal structural adaptations (their form and function) associated with each of the fo...
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Biology essays / Leprosy
Leprosy Report Leprosy has been around for thousands of years, since the biblical times. It was first identified by Gerhard A. Hansen in 1873. It was the first bacterium to be identified as disease causing in humans. It should be known that the word 'leper' has connotations of immorality and uncleanness and is considered very offensive. Leprosy is a chronic bacterial disease of the upper...
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In the past 300 million years, an innumerable variety of vertebrate species have evolved from the bony fishes of the early Paleozoic. At several points in evolutionary history, there have been periods of relatively rapid adaptation and expansion of organisms known as adaptive radiations. These are limited only by a speciesO adaptive potential and the adaptive opportunities of the environment. ...
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The Modern Synthesis is the theory used to explain and predict all of the traits, variation and changes in living things. It combines the older theories of evolution and Mendelian genetics with more recent discoveries in molecular genetics and cellular biology. Pheno- and genotypical changes can be explained and observed on the molecular, cellular, individual and populace scale through the moder...
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Today, all multicellular organism are composed of eukaryotic cells which are larger and more complex than prokaryotes. These eukaryotic cells consist of organelles, such as mitochondria and peroxisomes, which were once believed to have been prokaryotes. We will find that these two organelles, which have triumphed through evolution, serve important functions within cells. We will begin wi...
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Biology essays / Tobacco Industry
Tobacco industry are dangerous and that nicotine is addictive. A Liggett official made the statement last week in settling lawsuits by 22 states. The letters a new nationwide poll commissioned by an anti-smoking group indicated that 73 percent of Americans '' should hold hearings on the tobacco industry.'' Democrats held dramatic hearings in 1994 to investigate tobacco industry practi...
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Biology essays / Purple Loosestrife
Click Here For Research Papers Online! subject = Biology title = Purple Loosestrife papers = Lvl1 Biology 9/12/96 Purple Loosestrife Lythrum Salicaria L. or Purple Loosestrife is a plant causing much trouble today. It thrives in wetlands and marshes and is impervious to most harsh weather climates. It is indigenous to most parts of Europe Once established, Purple Loosestrife predom...
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Biology essays / Marfan's Syndrome
Click Here For Research Papers Online! papers = Marfan's Syndrome It has been about six months since my brother has been diagnosed with Marfan syndrome. He has always been tall for his age, but we never took it for anything more then that. After he broke his arm in a little fall, we brought him to a doctor. After the d The specialist performed alot of different tests on my brother. He first d...
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Biology essays / Marijuana Outline
What are all the different ups and downs of marijuana, what can it be used for, and what is it's role in today's society? Introduction I. Marijuana A. Getting high 1. Effects 2. How B. Hemp 1. What is it for a. Cothes/paper b. Seasoning/cooking II. Use A. History B. Who uses 1. Average user 2. Celebrities III. Medical use A. Pain reliever B. Legalization - yes or no 1. ...
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Biology essays / The XYY Syndrome
Click Here For Research Papers Online! subject = Intro to Biology title = XYY Syndrome papers = XYY Males XYY Syndrome is a rare genetic disorder which affects males due to an extra Y chromosome. Healthy males have 46 chromosomes including one X and one Y chromosome. Men with XYY syndrome have 47 chromosomes, two of which are Y chromosomes. It is not known why the extra Y chromosome occ...
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Biology essays / Bioethics Of Cloning
The Biothics of Cloning Bioethics, which is the study of value judgments pertaining to human conduct in the area of biology and includes those related to the practice of medicine, has been an important aspect of all areas in the scientific field (Bernstein, Maurice, M.D.). It is one of the factors that says whether or not certain scientific research can go on, and if it can, under which rules...
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Click Here For Research Papers Online! name = Fnord Discordia email = [email protected] publish = yes subject= Biology title = Mitochondria and Chloroplast Essay papers = Biology Mitochondria and Chloroplast Essay I. Introduction Out of all the organelles there are two that have fascinated microbiologists for the past hundred years. The first is the mitochondria, nicknam...
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Biology essays / Insects
Click Here For Research Papers Online! subject = biology title = Biology Instinct papers = Insects are neumerout invertebrate animals that belong in the Phylum Arthropoda and Class Insecta. The class Insecta is divided into 2 subclasses: Apterygota, or wingless insects, and Pterygota, or winged insects. Subclass Pterygota is futher divided on basis of metamorphosis. Insects that have ...
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Biology essays / Gregor Mendel
Click Here For Research Papers Online! subject = biology title = Gregor Mendel papers = Gregor Mendel played a huge role in the underlying principles of genetic inheritance. Gregor was born, July 22 1822 in Heinzendorf, Austrian Silesia (now known as Hyncice, Czech Republic), with the name Johann Mendel. He changed his name to Gregor in 1843. He grew up in an Augustinian brotherhood and...
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Biology essays / The Gian Clam
Click Here For Research Papers Online! subject = Biology title = The Giant Clam papers = Please put your paper here. The Giant Clam The giant clam is known as a reef dwelling mollusk. The domestication factor has become of large importance to the Indo-Pacific peoples. Mainly in the area of their diet. These huge clams are huge targets for fishermen and can be found easily...
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Biology essays / Eukaryotic Organelles
Click Here For Research Papers Online! Essay of Eukaryotic Organelles 10/1/96 The mitochondria has an eggshape structure. The mitochondria consists of an inner and outer membrane. The outer membrane is what shapes the organelle to its egglike shape. The inner membrane which folds inward makes a set of "shelves" or cristae that allow the reactions of the mitochondria to take place. The more...
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Click Here For Research Papers Online! 1. a) Bulk movement is the overall movement of a fluid. The molecules all move in the same direction. Diffusion however is the random movement of molecules which usually results in a fairly even distribution. In other words the movement is not guaranteed to move in one direction but the probability that it will move in the lower gradient is greater. Os...
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Biology essays / Basic Biology Help Sheet
Click Here For Research Papers Online! Proteins made from ribosomes attached to the rough endoplasmic reticulum enter the lumen of the ER and move to the smooth endoplasmic reticulum. A small vacuole (vesicle) pinches off the smooth ER and carries the protein to the Golgi apparatus, where it is further processed. ------------------------------------------------------------- Mitochondria...
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Biology essays / The Cystic Fibrosis Gene
Click Here For Research Papers Online! Biology - Genetics The Cystic Fibrosis Gene Introduction: Cystic fibrosis is an inherited autosomal recessive disease that exerts its main effects on the digestive system and the lungs. This disease is the most common genetic disorder amongst Caucasians. Cystic fibrosis affects about one in 2,500 people, with one in twenty five being a het...
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Biology essays / The Human Heart
Click Here For Research Papers Online! Biology - Histology The Human Heart. Abstract: Dorland's Illustrated Medical Dictionary defines the heart as "the viscus of cardiac muscle that maintains the circulation of the blood". It is divided into four cavities; two atria and two ventricles. The left atrium receives oxygenated blood from the lungs. From there the blood passes to the...
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Click Here For Research Papers Online! Biochemistry Prolonged Preservation of the Heart Prior to Transplantation Picture this. A man is involved in a severe car crash in Florida which has left him brain-dead with no hope for any kind of recovery. The majority of his vital organs are still functional and the man has designated that his organs be donated to a needy person upon his...
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Biology essays / Animal Research
Click Here For Research Papers Online! THE IMPORTANCE OF ANIMAL RESEARCH by: Josh Wakefield [email protected] Research on animals is important in understanding diseases and developing ways to prevent them. The polio vaccine, kidney transplants, and heart surgery techniques have all been developed with the help of animal research. Through increased efforts by the sci...
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Biology essays / Calcium Transport
Click Here For Research Papers Online! PHM499 Research Project Calcium transport study of SF-9 lepidopteran cells and bull frog sympathetic ganglion cells ABSTRACT The intracellular calcium level and the calcium efflux of the bull-frog sympathetic ganglion cells (BSG) and the SF-9 lepidopteran ovarian cells were investigated using a calcium-sensitive fluorescence probe fura-2. It was f...
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Click Here For Research Papers Online! THE EFFECTS OF ALTITUDE ON HUMAN PHYSIOLOGY Changes in altitude have a profound effect on the human body. The body attempts to maintain a state of homeostasis or balance to ensure the optimal operating environment for its complex chemical systems. Any change from this homeostasis is a change away from the optimal operating environment. The body at...
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Biology essays / Essay On Reptiles
Click Here For Research Papers Online! Essay on Reptiles Reptiles are vertebrate, or backboned animals constituting the class Reptilia and are characterized by a combination of features, none of which alone could separate all reptiles from all other animals. The characteristics of reptiles are numerous, therefore can not be explained in great detail in this report. In no special order, the...
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Biology essays / Angina Pectoris
Click Here For Research Papers Online! ANGINA PECTORIS Submitted by: Course: SBI OAO To: Date: CONTENTS 3 Introduction 4 The Human Heart 5 Symptoms of Coronary Heart Disease 5 Heart Attack 5 Sudden Death 5 Angina 6 Angina Pectoris 6 Signs and Symptoms 7 Different Forms of Angina 8 Ca...
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Biology essays / Humpback Whales
Click Here For Research Papers Online! To look up into the mountains and see the steam rolling from a mountain stream on a cold winters morning is a beautiful sight. However, to look out over the horizon and see the white spray of salt water coming from the blow of a huge hump-back whale is much more exciting sight and a whole lot warmer. I lived in the mountains of Colorado for most of...
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Click Here For Research Papers Online! Science Future Adaptations:Stingray Survival of the Stingray Imagine yourself 150,000 years in the future. Another ice age is in full force. Temperatures are much colder, vegetation has ceased to exist, along with several entire animal species. The lion, once the king of the jungle, is no more than an alley cat scavenging for food. The great wh...
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Richard Shine, Thomas R. L. Madsen, Melanie J. Elphick, and Peter S. Harlow authored the journal entry titled, "The Influence of Nest Temperatures and Maternal Brooding on Hatchling Phenotypes in Water Pythons" and had it published in volume 78(6) of Ecology in 1997. The work deals with the Water Python (Liasis fuscus) of Northern Australia and how temperature and the amount of maternal brood...
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By Cory Cooper 10th grade 1997-98 of RIO AMERICANO HIGH SCHOOL-leave my name please! Carolus Linnaeus was a Swedish naturalist and physician. He created the classification system for classifying plants and animals that is now universally used. He created the binomial system which each living thing is assigned a name that is made of two Latin words. The first word is genus and the sec...
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Biology essays / Evolution
Evolution A species cannot be created by mutating a species. No matter how many mutations occur the mutation does not evolve the species. No one has ever produced a species by means of natural selection. About 6 hundred million years ago the earliest know fossil record of animals were know to be alive. Amber has been preserved in the earth's crust for millions of years. Amber is a gem and i...
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Biology essays / Genetic Engeneering
Genetic Engineering I personally think that genetic engineering could be an excellent thing. People should be able to go as far as they can and do anything possible. Diseases could be avoided. Slow metabolic rates could be avoided, which result in overweight people. High and low cholesterol could be avoided. People wouldn't have to be deformed and look like mutants. People would be more...
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Biology essays / The Ebola Virus
The Ebola Virus The Ebola virus is one of the most deadly viruses that man kind has ever seen. In clinical cases it has a mortality rate of 50%-90%. The Viruses has many different strains including Marburg, Ebola Zaire, Reston and Sudan, each named after the location of their first clinical case. They each cause different symptoms and different mortality rates. Non the less, the collection o...
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Biology essays / Basking Sharks:
The Basking Shark: Hope for the Future? Introduction - What are the biological characteristics, habitat, and value of basking sharks? I. Interrelated life forms populate the oceans. A. Photoplankton synthesize food. 1. Using carbon dioxide 2. Dissolving minerals 3. Collecting sunlight energy B. Small fish consume photoplankton. C. ...
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Biology essays / The Boa Constrictor
1 The species of boa is an attractive and fascinating reptile. Due to their great adaptation abilities they make odd, but awesome pets. They eat rats, chicks, and other small mammals in captivity. Also successful breeding is possible if the creature is properly cared for. A unique and interesting animal, the Boidae, thrives in tropical and dry climates adapting well, eating a...
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Biology essays / Basking Sharks
Basking shark Cetorhinus maximus (Gunnerus) 1765 Bone Shark Bigelow and Schroeder, 1948, p. 147. In light of recent reports of basking sharks along the New England Coast we have assembled this page to provide information concerning this second largest of all sharks. This species is not known to be aggressive or dangerous but like any large animal should be treated with respect. The in...
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Biology essays / Yellow Fever
Yellow Fever Yellow fever is a viral disease transmitted between humans by mosquitoes but is noncontagious. Yellow fever is known for effecting humans, but also effect monkeys and other animals. The disease occurs only in parts of Africa and South America. But there are only some countries in Africa and South America that have endemic Yellow Fever. In South America the countries are Panama, Col...
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Biology essays / LSD
Lysergic Acid Diethylamide-25 Lysergic acid diethylamide-25, or LSD, commonly street named as "acid" or "sugar" is a member of the hallucinogenic drug class. Other members of the hallucinogenic drug class are psilocybin, and mescaline. A mild hallucinogen is marijuana. Hallucinogens alter the way time is perceived, making time itself to seem at a standstill. Most Hallucinogens produce Halluci...
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This paper is on the processes of fermentation, cellular respiration, photosynthesis, diffusion, osmosis, and enzyme activity. What do these six processes have in common? Fermentation is a chemical process that breaks down organic materials. This process is carried out by such microbes as bacteria, molds, and yeasts. For example, molds or fungi act upon mixtures of molasses and mineral s...
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Like many modern students, Charles Darwin exceeded only in subjects that intrigued him. Although his father was a physician, Darwin was uninterested in medicine and he was unable to stand the sight of surgery. He did eventually obtain a degree in theology from Cambridge University, although theology too was of minor interest to him. What Darwin really liked to do was to tramp over hills, observ...
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Photosynthesis is the process by which plant cells, algae, and some bacteria, capture light energy and change it to chemical energy. Almost all of the world's energy is provided through photosynthesis. The equation for photosynthesis is CO 2 + 2H 2 A + light energy---> (CH 2 ) + H2 0 + H2 A . Photosynthesis is in two stages : a series of reactions that need light and certain ...
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Biology essays / Science Vs. Ethics
Science vs. Ethics An elderly man is diagnosed with an aneurysm, the thinning in the wall of the aorta. In order to repair his failing artery, he receives a patch of healthy tissue-cloned from his own cells and cultured in a laboratory. A child is born free of the gene that allows sickle-cell anemia, despite both her parents being carriers. How was this possible? In the embryonic cell from which ...
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Biology essays / Cell Mitosis
The life Process of a cell In my report you will learn about the life process of a cell based on the two main functions, metabolism and mitosis. You will learn about the four stages of metabolism: ingestion, digestion, respiration, and excretion, and how the cell completes them. You also will acquire information about the four stages of mitosis: prophase, metaphase, anaphase, and telephase, ...
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Biology essays / Influenza
Clinical Features of Influenza Influenza, commonly called "the flu," is caused by viruses that infect the respiratory tract. Compared with most other viral respiratory infections, such as the common cold, influenza infection often causes a more severe illness. Typical clinical features of influenza include fever (usually 100oF to 103oF in adults and often even higher in children) and respirato...
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Biology essays / To Clone Or Not To Clone
The biological definition of a clone is an organism that has the same genetic information as another organism or organisms. From this definition and from information about the science behind cloning, my current view on cloning is that it is ethical. This statement ignores information about how we can misuse cloning and what consequences occur when the procedure is unsuccessful. In fact, I curren...
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Biology essays / Time Dialation
Close Encounters With the Effects of Time Dilation How does it feel to be going speeds near that of the speed of light? What is it like to return to Earth to find that your best friend who was the same age as you is now older than you? You might talk to a man named Bob Smith. Bob recently returned from his trip to the edge of the universe and we were fortunate enough to talk to Bob about w...
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A debate is currently raging throughout the world, from the halls of the United States Congress and the President's Oval Office to the United Nations and the World Health Organization. The issue: the cloning of human beings. Ever since researchers in Scotland cloned an adult sheep named Dolly over a year ago, the issue of applying this technology to reproducing human duplicates has been para...
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Biology essays / Frogs
Frogs Frogs are amphibians in the order Anura. The order Anura is broken down into twenty-two different families of frogs and toads. Although they belong to the same order, frogs and toads are different in a lot of ways. Some of the more distinct differences are their skin and where they live. Frogs usually have smooth, moist skin, and toads usually have dry, warty-looking skin. Frogs ...
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Biology essays / Big Brow Bat
Big Brown Bat Eptesicus fucus Kingdom: Animalia Phylum: Chordata (organisms that possess a structure called a notochord) Class: Mammalia (3 middle ear bones; hair; and the production of milk by modified sweat glands called mammary glands.) Order: Chiroptera (winged) Family: Vespertilionidae (This is the largest family of bats: it includes 35 genera and 318 spe...
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Biology essays / Gibb's Free Energy Cycle
The second law of thermodynamics states that energy transitions are imperfect. No matter what, energy is lost. In machines an 75% loss of energy is considered average. In biological reactions there is usually a 60% loss. Since all reactions are constantly losing a percentage of the energy they give, it is necessary to have a constant intake of energy to make up for what is lost. This intake o...
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Biology essays / Bacteria An Actual Report
Bacteria comes from the Greek word meaning "Little Staff" (Infopedia) (or more appropriately "Staph") which most likely refers to some form of Bacillus, but what is bachteria and why do we need it. When most people think of the idea of little crawlies on their skin, they pretty much freak (See Jackie Plank), but we need to see is the difference between the pathogens and the helpful bacteria, the g...
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Archaebacteria, simple organisms that resemble ordinary bacteria in that they lack a well-formed nucleus and can therefore be characterized as procaryotes in the classification of living organisms. Their biochemistry differs in important ways from that of other bacteria, however, and some biologists place them in a kingdom of their own. According to these theories, archaebacteria may be ancestral ...
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quantities of material with which to work. The process of engineering a DNA fragment into a vector is called "cloning," because multiple copies of an identical molecule are produced. Another way, recently discovered, of produsufficient cing many identical copies of a particular DNA fragment is polymerase chain reaction. This method is rapid and avoids the need for cloning DNA into a vector. Therap...
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BACTERIA ( Gr. bakterion, "little staff"), group of microscopic, unicellular organisms that lack a distinct nucleus and that usually reproduce by cell division. are tiny, ranging from 1 to 10 micrometers (1 micrometer equals 1/25,000 in), and are extremely variable in the ways they obtain energy and nourishment. They can be found in nearly all environments-from air, soil, water, and ice to hot spr...
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Biology essays / Lymphatic System
The Lymphatic System The lymphatic system is a collection of ducts organs and tissues, which collect excess fluid or lymph from your body and transport it back to the heart. The lymphatic system also helps to defend the body against infection. Lymph vessels of the neck These lymph vessels drain tissue fluid, or lymph, from the head and neck. The fluid is filtered through lymph nodes in...

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