The process by which natural variation among organisms that make them best adapted to their environment live and reproduce, therefore passing on to their offspring the genetic qualities best suited to that environment variation
variation

adaptation
adaptation

natural selection
natural selection

Evolution

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 .