Question

The phenomenon of fusion is likely to occur when, after a period of geographic isolation, two populations meet?

Answer 1

The right answer for the question that is being asked and shown above is that: "a decreasing number of viable, fertile hybrids is produced over the course of generations." The phenomenon of fusion is likely to occur when, after a period of geographic isolation, two populations meet is that a decreasing number of viable, fertile hybrids is produced over the course of generations.