Question

Which of these is an example of gene flow?

Answer 1

Are there answer choices?

Answer 2

A) German immigrants settle in a colony in Eastern Pennsylvania without mixing with the locals.B) A few black sparrows join a population of brown sparrows and mate with them. C) Indiscriminate hunting reduces the blue whale population, which later revives.

Answer 3

A. German Immigrants settle in a colony in Eastern Pennsylvania without mixing with the locals.
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Answer 4

they are both wrong, the is answer is
A few black sparrows join a population of brown sparrows and mate with them.