Which of the following is true about natural selection?

a. natural selection does not cause a species to change.
b. natural selection usually causes species to change gradually.
c. natural selection is the only cause of changes in a species.
d. natural selection usually causes a species to change suddenly.

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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 .