Science
The scientific world contains a wealth of knowledge that enables mankind to live the way it does. EssaysForStudent.com can help you close the gaps in your knowledge.
4,609 Essays on Science. Documents 1,111 - 1,140
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Dark Matter and Dark Energy
DARK MATTER AND DARK ENERGY The content of the Universe is widely thought to consist of three types of substance: visible matter, dark matter and dark energy. Visible matter (smallest proportion of the Universe - about 5% of the Universe) consists of the atoms that make up stars, planets etc and every other visible object in the Universe. Dark matter (25%) from astronomers observations of the Universe, there must be more matter - cannot be
Rating:Essay Length: 385 Words / 2 PagesSubmitted: October 19, 2014 -
Dark They Were, and Golden-Eyed
Dark They Were, and Golden-Eyed One of the major science fiction themes that are in Dark They Were, and Golden Eyed is the extrapolation when Harry Bittering first finds the tainted food and then the yellow eyes of the people. “’You know they have! Onions but not onions, carrots but not carrots. Taste: the same but different. Smell: not like it used to be’” (Bradbury 134). Then the part of the yellow eyes, “’Sam, you
Rating:Essay Length: 387 Words / 2 PagesSubmitted: January 1, 2010 -
Darwin
For thousands of years the only explanation for the existence of life on Earth rested in the Old Testament, with God as the creator of all living organisms. In spite of this, the nineteenth century included curiosity of the organisms that saturate the planet. Fascinated explorers investigated and analyzed every aspect of the lives of organisms. The newfound curiosity conflicted with the belief of the Church, which stood by its belief of heavenly creation. The
Rating:Essay Length: 1,467 Words / 6 PagesSubmitted: April 30, 2010 -
Darwin
When the name Charles Darwin is uttered, an immediate association brings about the concept of Evolution. Although he was not the first to discover this phenomenon, he was the first to explain it. In his book, The Origin of Species, Darwin discusses evolution- through variation, why it occurs, the struggle for existence, natural selection, the geological record, and several other topics. This book brought him great recognition as well as many violent attacks. It was
Rating:Essay Length: 1,659 Words / 7 PagesSubmitted: June 9, 2010 -
Darwin and His Dangerous Idea
Evolution can be defined as "the gradual process in which something changes into a different and usually more complex or better form." A biological definition of evolution is that of a "population during successive generations, as a result of natural selection acting on genetic variation among individuals, and resulting in the development of new species" (dictionary.com). According to these definitions, from the simplest to the most complex, it is obvious that evolution never even tries
Rating:Essay Length: 1,133 Words / 5 PagesSubmitted: March 30, 2010 -
Darwin's Theory of Evolution
Darwin's Theory of Evolution - The Premise Darwin's Theory of Evolution is the widely held notion that all life is related and has descended from a common ancestor: the birds and the bananas, the fishes and the flowers -- all related. Darwin's general theory presumes the development of life from non-life and stresses a purely naturalistic (undirected) "descent with modification". That is, complex creatures evolve from more simplistic ancestors naturally over time. In a nutshell,
Rating:Essay Length: 848 Words / 4 PagesSubmitted: March 11, 2010 -
Darwinian Selection in the Classifieds
Using comparative sequence analyses, we can identify proteins that may have been subject to positive darwinian selection. To test these statistical results, it is important to develop functional assays and identify amino-acid changes that are responsible for the adaptation of organisms to specific environments. One of the two duplicated pancreatic ribonuclease genes of a leaf-eating colobine monkey, douc langur, is now shown to have adapted to digest bacterial RNAs in the monkey's foregut. Organisms encounter
Rating:Essay Length: 280 Words / 2 PagesSubmitted: May 3, 2010 -
Darwinism
In the late 19th Century a term called Social Darwinism was established to describe the idea that humans, like plants and animals, compete in a struggle for existence. Social Darwinists base their beliefs on theories of evolution developed by British scientist and naturalist Charles Darwin. Darwin also created The Survival of the Fittest, meaning that the strong will survive and the weak will perish. Some social darwinists deny that they approve of the theory that
Rating:Essay Length: 445 Words / 2 PagesSubmitted: November 27, 2009 -
Darwinism
Theory of evolution Evolution theorist suggest that there is no god The theory of evolution is a philosophy and a conception of the world that produces false hypotheses, assumptions and imaginary scenarios in order to explain the existence and origin of life in terms of mere coincidences. The roots of this philosophy go back as far as ancient Greece. All atheist philosophies that deny creation, ectly or in ectly embrace and defend the idea of
Rating:Essay Length: 1,470 Words / 6 PagesSubmitted: February 28, 2010 -
Darwin’s Theory of Natural Selection
Charles Darwin revolutionized biology when he introduced The Origin of Species by Means of Natural Selection in 1859. Although Wallace had also came upon this revelation shortly before Origins was published, Darwin had long been in development of this theory. Wallace amicably relinquished the idea to Darwin, allowing him to become the first pioneer of evolution. Darwin was not driven to publish his finding, which he’d been collecting for several years before Wallace struck
Rating:Essay Length: 2,060 Words / 9 PagesSubmitted: November 22, 2009 -
Data Flow Diagram 1
DATA FLOW DIAGRAM Sumber : Metodologi Pengembangan Sistem Informasi, 1998. Leman, PT Elex Media Komputindo, Jakarta Pengantar Sistem Informasi Bisnis, 1995. Lani Sidarta, PT Elex Media Komputindo, Jakarta Data Flow Diagram (DFD) adalah representasi grafik dari sebuah sistem. DFD menggambarkan komponen-komponen sebuah sistem, aliran-aliran data di mana komponen-komponen tersebut, dan asal, tujuan, dan penyimpanan dari data tersebut. Kita dapat menggunakan DFD untuk dua hal utama, yaitu untuk membuat dokumentasi dari sistem informasi yang ada, atau
Rating:Essay Length: 1,031 Words / 5 PagesSubmitted: May 2, 2011 -
Database Administrators
1 Introduction Database is any collection of data or information, that is specially organized for rapid search and retrieval by a computer. Databases are structured to facilitate the storage, retrieval, modification, and deletion of data in conjunction with various data-processing operations. A database consists of a file or a set of files. The information in these files may be broken down into records, each of which consists of one or more fields. Fields are the
Rating:Essay Length: 1,500 Words / 6 PagesSubmitted: April 11, 2010 -
Dating Methods
With gratitude to a various amount of modern radiometric dating methods, scientists and researchers now have the ability to decipher the age, era, or period of earth’s ancient artifacts, geological strata, or fossils in which it now contains. Even the earth’s formation and existence can be subject to these scientifical dating methods. These methods can be performed on samples as small as one billionth of a gram; unfortunately, most of these experiments require the utilization
Rating:Essay Length: 301 Words / 2 PagesSubmitted: December 29, 2009 -
David Thorea's "walking"
In David Thorea's "Walking", he addresses what he thinks makes a piece of literature engaging and intriguing . Although the subject regarding literature was only a small portion in his essay, one could glean from reading the first few paragraphs, that Thorea highly regarded what he thought wild and uncivilized. However, how that should be displayed in a novel had to be contemplated with extreme care and precision. No one would sit and absorb themselves
Rating:Essay Length: 259 Words / 2 PagesSubmitted: April 28, 2016 -
Ddt
DDT Assignment 1.DDT is a very harmful pesticide that is used to control many different insects such as mosquitoes. 2.DDT is used as an insecticide in the agriculture and used to fight diseases such as malaria and typhus. 3.The population of pelicans shrank by about 90 percent in the 1960's. Scientist believe this is due to the pesticide DDT. 4.For decades a chemical plant had been dumping thousands of pounds of pesticides into the
Rating:Essay Length: 532 Words / 3 PagesSubmitted: March 1, 2010 -
Ddt and Pesticides
In today’s society the government plays an important part in the movements of environmentalists and “green” issues. These concerns are presented as choices of either economic growth or environmental protection. These environmentalists have been trying to ban a usage of a chemical that is a major issue presented in many countries and is a big threat to the environment and humans. I too share the same dream as an environmentalist to ban the usage of
Rating:Essay Length: 976 Words / 4 PagesSubmitted: February 3, 2010 -
Dead Sea
General Purpose: To inform Specific purpose: The audience will know that the Dead Sea is devoid of all plant and aquatic life, why the sea is so salty and the health benefits. Thesis or central idea: The Dead Sea has a unique environment Main Points: a. The Dead Sea is one of the saltiest bodies of water anywhere b. The Dead Sea is devoid of all plant and aquatic life c. The Dead Sea area
Rating:Essay Length: 1,339 Words / 6 PagesSubmitted: May 15, 2010 -
Debt Crisis in Europe
The PIIGS Sovereign-Debt Crisis Ayman Kamal Moawad Professor Hussein Soudi International Finance German University of Cairo 24 April 2011 Abstract The PIIGS crisis has raised fears about the possible negative implications it poses to the world economy. Doubts have risen about the integrity of the European Union and its currency. The five countries faced their own strand of fiscal distress due to heavy borrowing practices, property bubbles and living above their means. What intensifies
Rating:Essay Length: 5,177 Words / 21 PagesSubmitted: May 14, 2011 -
Decision-Making Model Paper
“Decision-Making Model Paper” We all make decisions of varying importance every day, so the idea that decision making can be a rather sophisticated art may at first seem strange. However, studies have shown that most people are much poorer at decision making than they think. An understanding of what decision making involves, together with a few effective techniques, will help produce better decisions. Problem/Situation Hodges Bend Middle School decided to have a Career Day for
Rating:Essay Length: 373 Words / 2 PagesSubmitted: November 24, 2009 -
Decompression Illness
Decompression Illness My article is on "The Physiology of Decompression Illness." Since the 1800's many scientists knew that high pressure can injure or kill. But only recently they are learning why. The purpose of studying decompression illness is to make diving safer. Decompression illness is a condition caused by forming nitrogen bubbles in the blood as a result of a spontaneous descent. When gas prevents expanding within the lungs from escaping. is called arterial
Rating:Essay Length: 1,028 Words / 5 PagesSubmitted: February 17, 2010 -
Decubitis Ulcers
Decubitis Ulcers J. Caldwell P.N.S. 1. Decubitis Ulcers are also known as bed sores.(Marsh 1) They are mostly seen in Geriatrics patients. They occur in people who are put on bed rest, or long periods of wheelchair use. “A traumatic decubitis ulcer is precipitated by continuous pressure on the skin and deep tissue with ischemic necrosis” (Plewig 369). These particular ulcers are mainly found on bony parts of the body. They develop when the cells
Rating:Essay Length: 1,367 Words / 6 PagesSubmitted: March 9, 2010 -
Deep Ocean
deep ocean The oceans cover 75% of the world's surface and contain 97% of its water; 90% of the seas lie beyond the shallow continental margins, and most are deeper than 2km. With the advent of modern science we have been able to discover what some of the deep ocean is like but there is still a vast area that remains unexplored. One thing we do know is that life at these depths is dominated
Rating:Essay Length: 948 Words / 4 PagesSubmitted: November 14, 2009 -
Deep Sea Creatures & Adaptations
“ Deep Sea Creatures” The ocean is composed of thousands of different types of species. The fish, turtles, sharks, and sea weed we all see is no where near what the bottom of the ocean is made up of or looks like. There is a whole, new, extraordinary world in the deep sea with creatures we never knew existed with their own life cycles, characteristics, and adaptations. Due to the wide variations of environmental settings
Rating:Essay Length: 601 Words / 3 PagesSubmitted: March 22, 2010 -
Defenitions of Terms
SCIENCE Solution-type of mixture formed when I substance dissolves in another Energy-The ‘colder’ the phase, tends to have less energy Freezing Point-Temperature where liquid turns to solid Atomic Number-Number of protons in the nucleus of an atom Matter-Has mass and takes up space 4 phases of matter-solid, liquid, gas, plasma Mixture-Matter that consists of 2 or more substances mixed together but NOT chemically combined ex: salt, sugar Atom-Smallest particle of an element that has the
Rating:Essay Length: 593 Words / 3 PagesSubmitted: November 19, 2009 -
Defense Measures
Defense Measures A mission to smash into a space rock to deflect it and study its structure has been given priority over five other potential asteroid projects by the European Space Agency. The slam-bang 'Don Quijote' mission would help scientists figure out how to deflect or destroy any asteroid in the future that might be found to be on a collision course with Earth. The project uses the Spanish spelling of Don Quixote, the protagonist
Rating:Essay Length: 1,382 Words / 6 PagesSubmitted: March 9, 2010 -
Definitions of the Dimensions of Health
Definitions of the dimensions of health Humans have been around for many centuries. In this century, we are growing more aware of the negative effects illness and stress have on the human body. We are also becoming aware of the necessary steps needed to be healthy and accomplish a longer life span. With the ever-growing number of diseases around the human population, it is imperative that humans realize the importance of being healthy. People believe
Rating:Essay Length: 676 Words / 3 PagesSubmitted: November 19, 2009 -
Deflexion
http://www.bio.puc.cl/caseb/simposiocarnivoros2009/U%20Mayor.jpg Ensayo de Deflexión http://www.bio.puc.cl/caseb/simposiocarnivoros2009/U%20Mayor.jpg “Ensayo de Deflexión” Laboratorio Nº5 Resistencia de Materiales Profesor: Rodolfo Danitz. 14/06/2016 Integrantes: * Índice Introducción Objetivos 1.1 Objetivos generales 1.2 Objetivos específicos. Materiales y equipos requeridos Descripción de la experiencia Marco Teorico Datos 8 Graficos 10 Cálculos 11 Analisis 12 Conclusiones 14 Bibliografía 15 Introducción Gran cantidad de estructuras se construyen a base de vigas, estas vigas se flexionan o distorsionan por la influencia de alguna fuerza externa. Para
Rating:Essay Length: 1,250 Words / 5 PagesSubmitted: June 16, 2016 -
Deforestaion
What do you think of when you hear the word rainforest? The words tree, rain, tropics, and lumber might come to mind. Well, there is another word that should come to mind. That word is deforestation. Deforestation is the clearing of trees and woodlands. In this case the clearing of trees in the rainforests of Africa. A forest is given its name when the crowns of trees touch each other to form a canopy
Rating:Essay Length: 1,170 Words / 5 PagesSubmitted: May 22, 2010 -
Deforestation
Deforestation is the permanent destruction of indigenous forests and woodlands. The term does not include the removal of industrial forests such as plantations of gums or pines. Deforestation has resulted in the reduction of indigenous forests to four-fifths of their pre-agricultural area. Indigenous forests now cover 21% of the earth's land surface. In a forest the crowns of individual trees touch to form a single canopy. In a woodland, trees grow far apart, so
Rating:Essay Length: 852 Words / 4 PagesSubmitted: December 11, 2009 -
Deforestation
Deforestation The planet Earth is being scarred. Everyday the people of the planet earth are polluting the planet’s air, water and land. These are all natural resources that are necessary for our survival on this planet. Yet, we continue to abuse our planet. Our world population is growing out of control. The simple lesson of supply and demand tells us that we will need more resources in order to support the booming population. One of
Rating:Essay Length: 1,890 Words / 8 PagesSubmitted: January 17, 2010