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Which of the following best represents an example of gene flow?

A

A tsunami wipes out all but a few members of a sea turtle population that inhabits a beach.

B

A group of polar bears migrates from the ice floes where they live to the nearby forest, where they interbreed with the brown bears there.

C

A large population of prairie chickens is reduced to small numbers by a virus.

D

A small population of white rhinos is reduced to fewer than a dozen individuals by hunters.

E

A population of mosquitos becomes resistant to pesticides used to control their numbers.

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