4.Natural selection is BEST described as a. able to generate new traits that better suit the species.
b. increasing the perfection of a species.
c. working on existing variation of traits to favor those better suited to the organism's environment.
d. causing the death of a significant proportion of the population.
e. driving the species toward an eventual endpoint sometime in the future.

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 .