Question

which of the following is an example of reproductive isolation? two populations of finches that cannot produce viable offspring two populations of finches that have different feather colors two populations of salamanders that live in different lakes two populations of salamanders that have different tail lengths

Explanation:

Reproductive isolation occurs when two populations cannot interbreed to produce viable, fertile offspring. Feather color, different lakes (habitat isolation which is a pre - zygotic barrier but not the full reproductive isolation as it doesn't mention inability to produce viable offspring), and tail lengths are not indicators of reproductive isolation. The key for reproductive isolation is the inability to produce viable offspring.

Answer:

two populations of finches that cannot produce viable offspring