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» Browse Science and Environment Term Papers
Vertebrate Adaptions For Terrestrial Life
Number of Words: 624 / Number of Pages: 3
... enters through the nasal passages, or the mouth, passes through the trachea,
then branches off at the two bronchi, and goes through many branching passages
called bronchioles, which end in alveoli. Alveoli are sack-like structures where
the circulatory system meets the respiratory system.
Since terrestrial vertebrates do not live in water, they need to develop
a means of conserving water. One way we do this is through our excretions.
Nitrogen forms a major waste product in animals. When amino acids and nucleic
acids are broken down, they release toxic ammonia (NH3). To rid the body of this ...
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"An Ecosystem's Disturbance By A Pollutant
Number of Words: 2974 / Number of Pages: 11
... non-target or target. Target effects are those
that can kill off the entire population. Non-target effects are those that
effects a significant number of individuals and spreads over to other
individuals, such is the case when crop dusters spread herbicides, insecticides.
Next we look at population damage by a pollutant, which in turn has a
detrimental effect on the ecosystem in several ways. First, by the killing of an
entire population by a pollutant, it offsets the food chain and potentially
kills off other species that depended on that organism for food. Such is the
case when a keystone species is ...
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The Science Of Cloning
Number of Words: 1666 / Number of Pages: 7
... the
individuals in congress, but as long as the general public is against
cloning, politicians will be too, so they can gain support from voters.
Even with all these setbacks, there are still major uses for cloning
research. Uses that will never present themselves unless people put down
their moral, ethical, and religious shields and allow the research to take
its course. Regardless of the majority opinion, cloning is just another
science. It deserves the time and mind straining efforts given by today's
scientists. It doesn't deserve to be shut out or pushed aside because
people are too paranoid to ...
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Chromosome Probes At The University Of Toronto
Number of Words: 726 / Number of Pages: 3
... be much simpler and faster to perform
and could be available to all pregnant women who wish to take advantage of
the technology.
Current prenatal testing involves growing fetal cells in vitro and
examining them, over one or two months, to see if there are two copies of
a particular chromosome, which is normal, or one or three, which is
abnormal. A test using Willard's probes would require only a few cells and
a few days to detect abnormalities. "I don't think it's beyond the realm
of possibility that these kinds of tests could eventually be done by an
obstetrician in the office during the early st ...
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Interview With An Alien
Number of Words: 4277 / Number of Pages: 16
... She is aware of
the continuous presence of what she calls her "live-in
companion," who answers to the name of Hweig.
Mrs. Kannenberg realizes that Hweig would be
explained away by conventional scientists in terms
of split personality or some other form of mental
abberation. Although she does not agree with this
interpretation of her situation, she does not claim to
have any paranormal abilities because of her contact
with Hweig. She does not seek publicity, nor does
she avoid it. She writes down dialogues and insights
she finds to be of particular interest as they occur ...
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Hard Water
Number of Words: 2266 / Number of Pages: 9
... owned and operated sources of drinking water, such as wells, cisterns and springs. On the other hand about 80percent of the population receives water from a community system”(1). Household pumps and community water systems a generally used by the majority of consumers. Household pumps are designed to pump ground water for household use, while a community system may use surface water or ground water for its supply. There are two main sources of water: surface water and groundwater. Surface water can be found in lakes, rivers and reservoirs while ground water lies under the surface of t ...
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Alzheimer
Number of Words: 968 / Number of Pages: 4
... day in town, the grandfather did something that no one could believe. He just awoke form his nap when he heard a noise that was very familiar to him. It was the sound of a train whistle. He ran running to the window and saw the smoke from a train headed toward town. A memory was triggered in his head and he went running from the house toward the train. While running to the train, he started to think back to when he used to work on the train. He was tried to remember all of the people he knew that would be working on this line. This is a perfect example of a person that has 's. They have fla ...
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Cobalt
Number of Words: 332 / Number of Pages: 2
... titanium, aluminum, cobalt and nickel can be made to become
permanently magnetic. One alloy, called Stellite, is an alloy of cobalt,
chromium, tungsten, and molybdenum. This alloy is extremely hard and keeps its
hardness at extreme temperatures. It has many uses: cutting tools are made of
it along with gas turbines. Zaire is the worldıs largest producer of cobalt
with 65% of the worldıs reserve.
Cobalt is a common trace element found in food. It is a component of
vitamin B12. It is important to our health. But excessive amounts may cause
nausea, damage to the heart, kidneys, and nerves, and ...
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Iron Increases Heart Disease
Number of Words: 789 / Number of Pages: 3
... effect that estrogen has on the blood vessels of females. There may actually be a direct correlation to reduced serum iron levels due to menses. Whereas men " build-up" iron in the blood, women cleanse themselves of iron buildup on the monthly basis. Meyers (1996) also states that oxidation, the process in which an atom increases its positive charges (Miller and Keane, 1992), of low density lipoprotein cholesterol is important in atherosclerosis, and since oxidation is catalyzed by iron, it has been hypothesized that the lower iron stores of women reduce their risk of CAD through lessened lipid ...
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Alcoholism 4
Number of Words: 1374 / Number of Pages: 5
... and blood pressure (Kestler 6). The body can absorb alcohol very quickly, approximately 20% goes directly into the blood stream from the stomach, the rest enters the body through the small intestine. Moments after alcohol enters the blood stream it reaches the Cerebral Cortex, the part of the brain responsible for judgement. The areas of the brain controlling caution and self control are effected first, so most people feel more relaxed. Extremely large doses of alcohol may result in coma or death (Knox 42).
Intoxication varies greatly from one person to the next depending on his/her blood alcohol ...
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