Which of the following is an example of reproductive isolation?
a.)two populations of finches that cannot produce viable offspring
b.)two populations of finches that have different feather colors
c.)two populations of salamanders that live in different lakes
d.)two populations of salamanders that have different tail lengths

An example of reproductive isolation is demonstrated in A. 2 populations of finches that cannot produce viable offspring. Due to the different species of finches, that result from a single species due them being isolated and differentiating into a new species, they can no longer reproduce as they are completely different species.