Evolution is A. a rare event.

B. currently occurring ONLY in scientific laboratories.

C. constantly occurring at the same rate in ALL organisms.

D. a process that occurs as a result of differences in reproductive fitness.

E. a process that occurred only in the past.

The image shows the evolution of a species of fish. a few fish from a population developed different social behaviors and evolved into different species. two fish according to the image, the fish underwent . the new species of fish had mating seasons that were different from that of the original fish. because of the differences in mating seasons, the fish underwent reproductive isolation. this mode of isolation would be .