The red line represented the chemical reaction without the enzyme, and the black line represents the activation energy with the enzyme. In what way does the addition of the enzyme effect the chemical reaction?

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 .