Question
Question: An inter – breeding population of finches became separated geographically, forming two isolated grou...
An inter – breeding population of finches became separated geographically, forming two isolated groups. Each group then became subject to different selective pressures. One group was then introduced into the habitat of the other. Which one of the following would determine whether they now formed two distinct species?
A
They had been separated for more than three million years.
B
They failed to produce fertile F1 hybrids.
C
They showed marked differences in he shape of their beaks.
D
Their plumage had become markedly different.
Answer
They had been separated for more than three million years.