A population of snail darters is drastically reduced by the introduction of a large predator fish in an isolated stream. The predators eat almost all darters less than 5 cm. long. Is this an example of a bottleneck or selection? Why?
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Natural selection is a process by which a
specific genetic makeup of a particular species
is affected. For example, consider the moth
population of pre industrial and industrial era
of Great Britain white moths survived
predators by blending in with
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