Which best describe the climate of the Cenozoic? complete ice coverage for the entire era

unusually high temperatures the entire era
early warmth followed by an Ice Age

cold and dry followed by a period of glaciation​

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 .