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» Browse Science and Environment Term Papers
The Big Bang Model
Number of Words: 1285 / Number of Pages: 5
... was no beginning in the past, nor will there be
change in the future. This model assumes the perfect cosmological
principle. This principle says that the universe is the same everywhere on
the large scale, at all times.2 It maintains the same average density of
matter forever.
There are observational evidences found that can prove the Big Bang
model is more reasonable than the Steady State model. First, the redshifts
of distant galaxies. Redshift is a Doppler effect which states that if a
galaxy is moving away, the spectral line of that galaxy observed will have
a shift to the red end. T ...
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Creationism And Darwinism
Number of Words: 1386 / Number of Pages: 6
... you are mindful of him? And the son of man, that You visit him?"
Creationism is the product of a literal interpretation of the Biblical story of Genesis. It holds that God created the world in a single act approximately 6,000 years ago--and that human beings, animals, and other forms of life exist today much as they did then. To many creationists, the theory of evolution is heresy. They argue that fossil records and other scientific evidence of evolution are either false or were themselves created by God.
"In the beginning, God created the heaven and earth."And the earth was without form, and void; ...
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Memory
Number of Words: 1045 / Number of Pages: 4
... for only an
instance (Memory p. 32). Suppose you see a tree , the image of the tree is
briefly held by the sensory memory and quickly disappears unless you transfer it
to your short-term memory (Rhodes p. 130). The next level is called short-term
memory. The image or fact can be held as long as the brain is actively thinking
about it (Loftus p. 392). For example , if you look up a number in the phone
book and repeat it to yourself until you dial it , that is a form of short-term
memory. Short-term memory lasts roughly half a minute unless it is transferred
to long-term memory . Long-term memory is t ...
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Transmission Of Aids
Number of Words: 575 / Number of Pages: 3
... and women. Heterosexual sex is now the main method of transmission in Singapore and over 75% of infections throughout the world are acquired through heterosexual intercourse.
Not everybody who has sex with an infected person will get infected. However, the risks increase sharply in the presence of other Sexually Transmitted Diseases (STD) i.e. gonorrhea, herpes and syphilis or when the infected person has symptoms of late HIV infection. Females have an eight times greater risk of catching the infection from an infected male than vice versa whereas anal intercourse without condoms carry the highest ...
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Tigers
Number of Words: 1606 / Number of Pages: 6
... tails for balance when they run through fast turns. They also use their tails to communicate with other .
Where did tigers come from? Tigers (and all other carnivores) are descended from civet-like animals called miacids that lived during the age of the dinosaurs about 60 million years ago. These small mammals, with long bodies and short flexible limbs, evolved over millions of years into several hundred different species, including cats, bears, dogs and weasels. Approximately 37 cat species exist today, including Panthera tigris, the tiger. Tigers evolved in eastern Asia, and while some of the ea ...
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Acetaminophen
Number of Words: 415 / Number of Pages: 2
... 3-5% is catabolized by enzyme reactions to the acid. The metabolites are excreted in the urine.
The dosage of the drug should be used according to the carton instructions. A 10 gram over dose in adults, 140 mg for kids, can cause permanent liver damage. Also if you had just taken some other drugs , The may become more toxic since the drugs are catabolized in the liver. To protect yourself from injury, you should take 1 gram of vitamin C and Cysteine -a bodily antioxidant.
The kidneys can be permanently damaged if you continuously take the drug over a long period of time. You can get all ...
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The Ozone Layer
Number of Words: 1504 / Number of Pages: 6
... dioxide play an important role in
climate changes. For this reason many scientist have expressed concerns over
the global increase of carbon dioxide in resent decades, largely as a result of
the burring of fossil fuels. In many other factors of the earth’s present
climate remain more or less constant, the carbon dioxide increase should raise
the average temperature at the earth’s surface. Because warm air can contain
warm water before reaching saturation than cooler air can, the amount of water
would probably increase as the atmosphere got warmer . This process could go on
forever. Although this c ...
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Acid Rain
Number of Words: 766 / Number of Pages: 3
... is harmful to the environment because of its low pH. It can harm the biotic components of earth, and also the abiotic components. It's high acidity degrades soil to the point where it cannot support any type of plant life. Trees in forests are killed over long-term exposure. When these trees are killed, an imbalance in the hydrologic cycle can occur. Without living trees to consume the precipitate, it must be consumed by the earth or any other plants. These will receive an excess of water, causing other problems in the hydrologic cycle. This in turn causes a chain reaction of death among our for ...
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Chemical Warfare
Number of Words: 385 / Number of Pages: 2
... during World War I. Some other chemical agents can cause temporary blindness or mental confusion.
But people still can defend themselves against all of these chemical agents. For example, gas masks, other protective coverings for the body, and injections of antidotes are used as defenses against chemical agents.
Chemical agents also have nonmilitary uses. For example, riot control agents, including tear gas, can be used to control rioting crowds. These agents just affect the eyes, nose, and throat. They can cause blinding tears and a lot of times, violent coughing. But the effects of the gas aren't to ...
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The Hippopotamus: Endangered Species Report
Number of Words: 641 / Number of Pages: 3
... last
week's annual Convention on International Trade in Endangered Species in Florida,
for a ban on hippo poaching. But they say they're a long way from putting an
end to the slaughter." (Howard & Koehl)
The hippopotamus is an enormous amphibious animal with smooth, hairless skin.
Hippos can be found in Liberia, the Ivory Coast, and a few can also be found in
Sierra Leone and Guinea. Hippos used to be found anywhere south of the Sahara
Desert where they could find enough water and plenty of room to graze. Now, due
to poachers and predation they are confined to protected areas, but they can
sti ...
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