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4,404 Essays on Science. Documents 1,471 - 1,500

  • Evolution of Modern Humans

    Evolution of Modern Humans

    There are two main theories regarding the origin of modern humans. The first theory suggests that pre modern humans evolved into modern humans prior to leaving Africa and then dispersed in different directions; this theory is called the “Out of Africa Theory”. The second theory suggests that pre modern humans left Africa and dispersed in different directions and evolved into modern humans, this is called the “multi regional theory”. I personally believe in the “out

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    Essay Length: 843 Words / 4 Pages
    Submitted: February 19, 2010 By: regina
  • Evolution of Plants - Biology 2002

    Evolution of Plants - Biology 2002

    Emms, Simon K. "Evolution of Plants." Biology. 2002. Retrieved October 30, 2014 from Encyclopedia.com: http://www.encyclopedia.com/doc/1G2-3400700159.html.Modern classification systems, based largely on molecular evidence, divide living organisms into three domains: Bacteria (also called Eubacteria), Archaea, and Eukarya. Plants are classified as a kingdom (Plantae) within the Eukarya; organisms that possess a nucleus, mitochondria, an internal cytoskeleton, and, in photosynthetic species, chloroplasts. Most scientists recognize three other eukaryotic kingdoms: Protista (most of which are single-celled organisms), Fungi, and

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    Essay Length: 267 Words / 2 Pages
    Submitted: October 30, 2014 By: Keith Howes
  • Evolution V. Creation

    Evolution V. Creation

    Evolution Should the stork theory appear in books on reproduction? How about astrological lore in expositions on astronomy? It would be unreasonable to even consider those ridiculous concepts. This is why the idea of creation should not be considered as the answer to how life began. Rather, the theory of evolution accounts for the creation of life. Charles Darwin is credited with creating the theory of evolution. Evolution assumes that all natural forms arose

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    Essay Length: 1,859 Words / 8 Pages
    Submitted: March 13, 2010 By: Mike
  • Evolution Vs. Creationism

    Evolution Vs. Creationism

    People are always arguing over which theory is true, evolution or creationism. The theory of evolution has a lot to do with natural selection. Natural selection is when the individual with the best traits survives, and passes on their good traits to their offspring. Those offspring create more individuals with those strong traits, and eventually all of the species will have those strong traits. This means that if this cycle is carried on long enough,

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    Essay Length: 759 Words / 4 Pages
    Submitted: December 5, 2009 By: Jessica
  • Evolution Vs. Creationism: Disproving the Theory of Evolution

    Evolution Vs. Creationism: Disproving the Theory of Evolution

    Evolution vs. Creationism: Disproving The Theory of Evolution Since the 19th century, biologists have questioned the origin of life, asking the question “How did life first begin?” To answer that question, they have come up with two contradicting yet plausible theories, Creation and Evolution. The theory of Creation states that an intelligent being designed each organism. On the other hand, the theory of Evolution states that some form of stimuli sparked one of the earliest

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    Essay Length: 1,894 Words / 8 Pages
    Submitted: January 14, 2010 By: David
  • Ewrfer

    Ewrfer

    Willy's believed that all it takes to become successful is being well liked. Willy thought that Oliver would let Biff borrow some money even though if Bill Oliver hasn't seen Biff around ten years. " You know why he remembered you, don't you? Because you impressed him in those days." (pg.108) Biff stole Oliver's basketball and it been a long time that Oliver didn't see or contact with Biff, so there is no way

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    Essay Length: 505 Words / 3 Pages
    Submitted: April 21, 2011 By: milzy2233
  • Exciton Energy of Cds Quantum Dots

    Exciton Energy of Cds Quantum Dots

    Studying the quantum size e ects on the exciton energy of two-dimensional CdS quantum dots in the single band e ective mass approximation for both electron and hole, we use a nite con nement in the x{y plane and we assume also that the induced charge is spread along a very thin interface in the z-direction. Solving the SchrЁodinger equation with a new numerical method, which is called potential morphing method, we obtain the corresponding energy within

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    Essay Length: 2,810 Words / 12 Pages
    Submitted: January 2, 2010 By: Bred
  • Exercise and Aging - a Qualitative Correlation

    Exercise and Aging - a Qualitative Correlation

    EXERCISE AND AGING: A Qualitative Correlation In 1523 the Spanish explorer and conquistador Ponce de Leon went searching for the legendary Fountain of Youth. What he discovered was Florida; not quite the quick-fix of a magical substance flowing from a fountain but a nice place for frozen northeastern residents to go for recreation in the winter. The idea of mythical youth is still very much alive in our culture and most noticeable in the advertising

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    Essay Length: 2,929 Words / 12 Pages
    Submitted: November 17, 2009 By: Mike
  • Exercise and Obesity

    Exercise and Obesity

    Introduction There is a growing understanding of how certain levels of physical activity may positively affect cardiovascular, musculosketetal, respiratory and endocrine function, as well as mental health (Kravitz, 2007). The Surgeon General's report (1996) on physical activity and health emphasizes that regular participation in moderate physical activity is an essential component of a healthy lifestyle. Several studies (Haapanen et al, 1996, Lee et al, 1994) have shown that physical activity enhances health and reduces the

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    Essay Length: 1,809 Words / 8 Pages
    Submitted: November 10, 2009 By: Yan
  • Existence of Yetis

    Existence of Yetis

    Existence of Yetis The existence of yetis, also known as sasquatches, is really unknown. Stories of yeti confrontations vary beyond reason. Most of these stories are found in Native American legends (Stonehill 1). Theories are so outrageous that doubt flourishes. A yeti is a large bear or gorilla like mammal that is mainly found in the Himalayas. It is a biped which means that it walks on its two hind feet, upright. From a distance,

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    Essay Length: 1,178 Words / 5 Pages
    Submitted: January 14, 2010 By: Fatih
  • Experiment 12: Avogadro's Number

    Experiment 12: Avogadro's Number

    CHEMISTRY I Experiment 12: Avogadro’s number (hand out) Introduction: The objective of this experiment is to determine the value of Avogadro’s number and the mole concept via the use of the monolayer experiment. Experimental data sheet: Attached Calculations: 1. Area of monolayer A= 3.14(8.58 cm)І / 4 A= 231 cmІ / 4 A = 57.8 cmІ 2. Molecules of stearic acid in monolayer 57.8 cmІ x 1molecule = 2.8 x 1016 molecules 2.1 x

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    Essay Length: 599 Words / 3 Pages
    Submitted: April 8, 2010 By: Victor
  • Experiment 17

    Experiment 17

    Experiment 17 Polymers By Kaiyi Hall 3/7/16 Dr. Liskin Background Polymers are macromolecules built from smaller molecular subunits, called monomers. Synthetic polymers can be classified into two main types according to the mechanism by which they synthetically grow from monomer to polymer: chain-growth polymers and step-growth polymers. This classification scheme is an update from historical nomenclature, in which polymers were classified by whether there existed a byproduct of the polymerization reaction (condensation polymerization) or not

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    Essay Length: 701 Words / 3 Pages
    Submitted: March 21, 2016 By: Kaiyi H
  • Experimental and Numerical Studies of Foam-"lled Sections

    Experimental and Numerical Studies of Foam-"lled Sections

    * Corresponding author. Tel.:#1-617-253-2104; fax: #1-617-253-1962. E-mail address: wierz@mit.edu (T. Wierzbicki) International Journal of Impact Engineering 24 (2000) 509}534 Experimental and numerical studies of foam-"lled sections Sigit P. Santosa!, Tomasz Wierzbicki!,*, Arve G. Hanssen", Magnus Langseth" !Impact & Crashworthiness Laboratory, Massachusetts Institute of Technology, Room 5-218, 77 Massachusetts Avenue, Cambridge, MA-02139, USA "Department of Structural Engineering, The Norwegian University of Science and Technology, N-7034, Trondheim, Norway Received 30 September 1998; received in revised form 29

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    Essay Length: 2,709 Words / 11 Pages
    Submitted: January 25, 2010 By: regina
  • Experimental Design Project

    Experimental Design Project

    Since the early 1990’s, people have been complaining about the reception they get on their cellular phones. Several products have been on the market, but few actually work. This experiment is to disprove one of these products, which is known as a Cellular Reception Booster Sticker. This product started to show up on the market in early to mid 2001. Supposedly this product works as a passive antenna which will draw more signals into the

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    Essay Length: 285 Words / 2 Pages
    Submitted: November 16, 2009 By: July
  • Experimental Mealworm Lab

    Experimental Mealworm Lab

    Question and Problem Statement I am trying to learn about things that I didn’t know about before. I am discovering a whole new type of life and explore all the things I didn’t think existed before this class. I thought that this was really important that we did different experiments so we could see the reaction on them and study the cause and effect of each one. Literature Search A mealworm at that stage can

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    Essay Length: 325 Words / 2 Pages
    Submitted: January 2, 2010 By: Janna
  • Experimental Organic Chemistry: A Miniscale and Microscale Approach. 4th Edition

    Experimental Organic Chemistry: A Miniscale and Microscale Approach. 4th Edition

    Simple Distillation Experimental Organic Chemistry: A Miniscale and Microscale Approach. 4th Edition. By Gilbert and Martin. Section: 4.4 Introduction: Distillation is a technique used to purify various liquids. In a simple distillation, a liquid is boiled and the vapors work through the apparatus until they reach the condenser where they are cooled and reliquified. Liquids are separated based upon their differences in boiling point in which each pure substance is at least greater than 40-50

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    Essay Length: 357 Words / 2 Pages
    Submitted: February 28, 2010 By: Janna
  • Experimental Report of Factors Influencing the Rate of a Chemical Reaction

    Experimental Report of Factors Influencing the Rate of a Chemical Reaction

    Factors Influencing Rate of Reaction Aim To investigate several effects believed to influence rate of reaction, concentration of a substance and temperature, and observe the effects. Hypothesis Concentration and temperature will both increase the rate of reaction in accordance with collision theory. Introduction The reaction rate or rate of reaction for a reactant or product in any given reaction can be defined as the speed with which a reaction occurs. For example, the oxidation of

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    Essay Length: 814 Words / 4 Pages
    Submitted: May 5, 2010 By: Edward
  • Experimental Uncertainty and Error Analysis

    Experimental Uncertainty and Error Analysis

    Abstract The diameter and mass of a steel ball was measured and recorded by the class. These measurements were to determine error in measurements and the derived quantities, volume and density. The diameter was determined using a dial caliper and the mass, a triple beam balance. The results of the error for diameter were not as expected while the results of the volume and density were deviated greatly from expectations; only the weight had a

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    Essay Length: 339 Words / 2 Pages
    Submitted: December 29, 2009 By: David
  • Explain the Concept of Energy Transfer from one Form to Another in the Context of the Summary Equation for Aerobic Respiration

    Explain the Concept of Energy Transfer from one Form to Another in the Context of the Summary Equation for Aerobic Respiration

    Edwin Mageto Cellular respiration learning respiration. Explain the concept of energy transfer from one form to another in the context of the summary equation for aerobic respiration. Aerobic respiration can be defined as the process of energy transfer that the cells utilize to convert organic molecules into chemical energy. The chemical reactions involved in aerobic respiration are more or less analogous to the chemical reactions proceeding in the oxidation of organic substances, but no ATP

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    Essay Length: 3,234 Words / 13 Pages
    Submitted: July 25, 2015 By: kavuela
  • Exploration of Alienation

    Exploration of Alienation

    Exploration of Alienation “It has to go”, cried his sister. “That’s the only answer, Father. You just have to try to get rid of the idea that it’s Gregor. Believing it for so long, that is our real misfortune. But how can it be Gregor? If it were Gregor, he would have realized long ago that it isn’t possible for human beings to live with such a creature, and would have gone away of his

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    Essay Length: 953 Words / 4 Pages
    Submitted: December 22, 2009 By: Fonta
  • Exploring Stem Cell Research

    Exploring Stem Cell Research

    Exploring Stem Cell Research Imagine a world where transplants could be done without the sacrifice of another person losing an organ. This world can only exist within the process of stem cell research. In stem cell research there are four different ways to obtain the embryo, some more controversial then the others. The advantages and disadvantages of obtaining these embryos, and stem cell research as a whole, are what many people are comparing. Stem cell

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    Essay Length: 1,405 Words / 6 Pages
    Submitted: March 10, 2010 By: Fonta
  • Extennsa Proposal

    Extennsa Proposal

    Executive Summary Newbot Corporation needs a clear and powerful strategy on how to market Extenssa to surgeons and anesthesia professionals as this product has the potential to revolutionize the treatment of high blood loss surgeries. Over the years, medical practitioners have stressed the vital need for strong plasma volume expanders to eliminate the risk of hypovolemia or high blood loss during open heart surgeries, accidental trauma surgery and other high risk surgical procedures. The leading

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    Essay Length: 692 Words / 3 Pages
    Submitted: January 25, 2010 By: Yan
  • Extern

    Extern

    Anthrax Bacillus Anthracis Anthrax is a bacterial disease caused by bacillus anthracis, a large, gram-positive, rod-shaped bacterium. The bacterium was discovered in 1850 by German physician Robert Koch. Koch grew cultures of the anthrax bacteria and injected it into healthy animals to prove that it in fact was the cause of the disease. Later, Louis Pasteur used compromised anthrax bacteria to develop a vaccine for the disease that was proven to be successful in animals.

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    Essay Length: 1,599 Words / 7 Pages
    Submitted: June 1, 2010 By: Fatih
  • Extinction and Its Impacts

    Extinction and Its Impacts

    Extinction is the ceasing of a species to exist on this Earth. A species officially becomes extinct when all of the species no longer exists. A species is to become certainly extinct when there is an extremely small number of it and it is unable to reproduce to create more of itself. Therefore, we say a species is in for certain extinction if it cannot reproduce itself. Extinctions occur at a great pace and species

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    Essay Length: 2,044 Words / 9 Pages
    Submitted: January 15, 2010 By: Top
  • Extinction of Dinosaurs

    Extinction of Dinosaurs

    Extinction of Dinosaurs Two-hundred and thirty million years ago the first dinosaur-like creature roamed the earth. Dinosaurs were a very successful and diverse group, dominating the terrestrial environments of the earth for 160 million years. The apparently sudden mass extinction of dinosaurs marks the boundary between the Cretaceous and Tertiary periods. Though there is not one definitive explanation to explain dinosaurs’ extinction, there are various theories that attempt to account for the mystery of their

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    Essay Length: 960 Words / 4 Pages
    Submitted: November 20, 2009 By: David
  • Extinction of Great Apes

    Extinction of Great Apes

    The great apes are humankind’s closest relatives. Great apes include gorillas, chimpanzees, orangutans, and bonobos, which are also known as pygmy chimps. At the turn of the century, there were approximately one million chimpanzees in Africa. This number has declined down to 150,000. Mountain gorillas have halved in size over the last ten years, leaving only 320 to roam the trees of their homeland. Some say these great apes will face extinction within a decade.

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    Essay Length: 1,063 Words / 5 Pages
    Submitted: March 21, 2010 By: Tommy
  • Extra Credit Assignment

    Extra Credit Assignment

    Stephanie Zeibak 10.13.15 Dr. Ribes Extra Credit Assignment John H. Blaffer lecture series at MD Anderson featured Dr. Vicki Lindblad in her lecture discussing “Maintaining Telomere Homeostasis: The Intersection Between Telomerase and DNA Replication”. Basic concepts that were introduced during the lecture and that should be known before continuing is what telomeres are, what telomerase is, and what is DNA replication. Telomeres, which are the ends of chromosomes, are important for genome stability and cell

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    Essay Length: 512 Words / 3 Pages
    Submitted: October 26, 2015 By: sjzeibak
  • Extraction of Dna from Calf or Hog Thymus/isolation of Yeast Rna

    Extraction of Dna from Calf or Hog Thymus/isolation of Yeast Rna

    Extraction of DNA from Calf or Hog Thymus/Isolation of Yeast RNA I. Abstract Nucleic acids may be divided into two groups RNA and DNA. DNA contains almost all the genetic information while RNA serves as the bridge between the DNA and proteins. Study of both DNA and RNA initially involves proper extraction/isolation. The storehouse of eukaryotic DNA is the nucleus (and in the mitochondria), so experimentally, DNA is extracted from tissues that have a high

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    Essay Length: 480 Words / 2 Pages
    Submitted: December 9, 2009 By: July
  • Extraction of Dna from Calf or Hog Thymus/isolation of Yeast Rna

    Extraction of Dna from Calf or Hog Thymus/isolation of Yeast Rna

    Extraction Of Dna From Calf Or Hog Thymus/Isolation Of Yeast Rna Submitted by wasabi on July 5, 2006 Category: Science Words: 3228 | Pages: 13 Views: 226 Popularity Rank: 31,078 Average Member Grade: N/A (Add a Comment / Grade this Paper) Extraction of DNA from Calf or Hog Thymus/Isolation of Yeast RNA I. Abstract Nucleic acids may be divided into two groups RNA and DNA. DNA contains almost all the genetic information while RNA serves

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    Essay Length: 336 Words / 2 Pages
    Submitted: January 3, 2010 By: regina
  • Exxon Oil Spill

    Exxon Oil Spill

    Oil spills have often occurred too many times in this world. Unfortunately, when this does happen, there is always losses of life. Many people are affected by it. There is always a price to pay. On March 24, 1989 the Exxon Valdez oil tanker spilt all its oil into the ocean. Going about twelve miles per hour, the doubt of a oil spill was highly unlikely. But, when the oil tanker hit Bligh Reef in

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    Essay Length: 1,061 Words / 5 Pages
    Submitted: March 9, 2010 By: David
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