The diameter of arterioles is regulated by .

A.) the skeletal muscle pump
B.) the parasympathetic division of the ANS adjusting diameter to regulate systemic blood pressure
C.) local factors (chemicals) in peripheral tissues signaling smooth muscle cells to either contract or relax
D.) valves inside the arterioles
E.) precapillary sphincters

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 .