APES 2000 Free Response

APES 2000 Free Response - Dan Herber February 7, 2008 From...

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Dan Herber February 7, 2008 From the APES 2000 Free Response Section: Species such as the dusky seaside sparrow, passenger pigeon and the woolly mammoth are extinct. Populations of other species have declined to the point where they are designated as threatened or endangered. a) Bald eagles, which used to be endangered but now are only threatened, are making a strong comeback after chemicals hindered their reproduction. Also, hunting and habitat destruction contributed to the decline in population. b) One is low genetic variability, which is the amount of genetic differences in a population. The higher the genetic variability, the more likely a species is going to survive if a harmful factor is introduced into their environment because specific mutations in the genetic code might allow for the species continued existence. Another characteristic is the lack of coverage from predators, which could cause more predators to eat too many of the organism, causing it to become extinct. An example of this is a dark seal in the white snow, which
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APES 2000 Free Response - Dan Herber February 7, 2008 From...

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