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» Science Essays and Papers
Environmental Protection
<view this essay>.... point this out. They also suggest that the role of homo sapiens in causing extinction should not be distinguished from that of any other species. This position, most often espoused by individuals whose other views are curiously much more anthropocentric, is contrary to some well established facts. Unlike other creatures that have inhabited the Earth, human beings are the first to possess the technological ability to cause wholesale extermination of species, genera or even entire families of living creatures. This process is accelerating. Wildlife management efforts initiated during this century have been unsuccessful in stemming the tide.
Most public a .....
Number of words: 1958 | Number of pages: 8 |
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Lung Cancer
<view this essay>.... Small cell is limited to a section of the chest known as the hemithorax and regional lymph nodes (World Book, “”). Small cell usually exists early and spreads out abruptly (Virtual Hospital, 3/23/99). Non-small cell is first confined to the lung, then spreads throughout the chest (MSKCC, “”). Small cell spreads quickly (World Book, “”).
In the United States 85 to 90 percent of all cases are related to smoking. Cigarette smoking is the main cause of (Scientific American, “”). Second-hand smoke, inhaled by non-smokers, increases a person’s chance of acquiring (Beau Halton). Men who smoke incr .....
Number of words: 689 | Number of pages: 3 |
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Endangered Species Of South
<view this essay>.... in the course of evolution, and is called the background rate of extinction (Lampton 14). Species have slowly evolved and disappeared throughout geological time because of climate changes and the inability to adapt to survive competition and predation. Since the 1600's, however, the rate of extinction has accelerated rapidly because of human population growth and resource consumption (17). Today, most of the world's habitats are changing faster than most species can adapt to such changes through evolution, or natural selection. The current global extinction rate is estimated at about 20,000 species per year, exponentially greater than the background ex .....
Number of words: 1449 | Number of pages: 6 |
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Health Risks Of Secondhand Smoke
<view this essay>.... should be banned. But Viscusi fails to tell the reader what the "Gallup poll" is, when it was taken and who produced it. Equally important, in the seventh paragraph Viscusi states that "cancer researchers" generally note. Again he fails to let the reader know the credentials of the cancer researchers. Another example of poor credentials is when Viscusi states some percentages in "a 1991 survey of company smoking policies". He again fails to let the reader know the credentials of the survey.
Another explanation as to why Viscusi's article is not successful is because the organization is confusing. The thesis Viscusi is trying to prove is that the are exag .....
Number of words: 525 | Number of pages: 2 |
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Acid Rain
<view this essay>.... Acid rain makes the tree weaken and poisons it with
toxic substances that are slowly released from the soil (EPA). When the trees weaken from the
acid, it has a harder time fighting off adversaries such as fungi, diseases, and frost so
subsequently it dies. Around the 1970s the acid rain dilemma got worse, the acid rain has put
trees in danger and now they are starting to die off. The effects of acid rain on a tree is shown if
it has less foliage, yellow spots and produces many cones (Baines, 22). Secondly, acid rain
damages the trees through the soil by releasing metals that harm them even further (Lucas, 72).
Acid rain makes th .....
Number of words: 593 | Number of pages: 3 |
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Lime Disease
<view this essay>.... allows the organism
to make antigenic changes in these proteins. When a borrelia cell attaches to its host,
the whole outer membrane moves to one end of the cylinder, which is called capping to
patching1. B. burgdorferi do not live in water, soil, or plants. Borrelia grow slowly
compared to most bacteria. They elongate for 12 to 24 hours before dividing into two
cells. B. burgdorferi is approximately 20 to um long and 0.2 to 0.25 um wide, with 7 to
11 flagella. More than 30 proteins are contained within B. burgdorferi1. This bacteria
uses white-footed mice, mosquitoes, and deer as their hosts.
This disease does not discriminate between sex and .....
Number of words: 916 | Number of pages: 4 |
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Hereditary
<view this essay>.... who you are is the environment you live in. The
environment you are in may affect how you develop. For instance, if you
have a talent for music, but have no way to acquire instruments, then it is
doubtful that you will ever discover your talent with music. Physically,
you may have great potential as a runner, but, if you do not get enough to
eat, then it is doubtful that you will ever live up to your potential.
Traits such as what you look like are inherited from your parents.
Your potential is also inherited from your parents. Chromosomes contain the
information of a person's potential height, potential strength against
disease, and other physical char .....
Number of words: 979 | Number of pages: 4 |
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Alternative Energy Sources
<view this essay>.... alternatives be implemented long before the current supply is depleted.
Without question, the world's energy demand has increased due directly to the fact that the population continues to rise. What this translates to in correlating statistics is that energy demands throughout the past half century have tripled, the global economy has quintupled and the world population increased twofold (Anonymous em_txt4.html).
Richard Cromwell, general manager of SunLine Transit Agency in Southern California's Coachella Valley, is a firsthand proponent of alternative fueling. Having to smell the awful odor emitted day after day from his fleet of forty-seven buses, Cromw .....
Number of words: 1121 | Number of pages: 5 |
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