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 produce viable offspring. Physical differences like feather - color, tail - length, or living in different lakes are not direct indicators of reproductive isolation.

Answer:

two populations of finches that cannot produce viable offspring