Darwin's Natural Selection

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Issue:

Science

 

Written by:

Jen W

 

Date added:

August 13, 2011

 

Level:

University

 

Grade:

A

 

No of pages / words:

2 / 382

 

Was viewed:

7362 times

 

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Essay content:

As defined by Webster's dictionary, evolution is "descent of organisms by modification," In other words, evolution is the changing of organisms. This is best understood in a hypothetical situation. If there is an organism X and it evolves into organism Y, both occupy different niches. Organism X eats only small seeds and organism Y eats large seeds...
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Organism X eats only small seeds and organism Y eats large seeds. If the environment changes, and say acid rain wipes out all of the big seeds then only organism Y will be able to survive. This is an example of a genetic bottleneck, a reduction of genetic diversity. In another study of moths, there are black moths and white ones...
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