Blood is moved through the vascular system by
a. valves in the wall of the blood vessels.
b. peristalsis caused by smooth muscle in the blood vessel walls.
c. pressure gradients created by the heart.
d. osmotic pressure.
e viscosity of the blood

Blood is moved through the vascular system by pressure gradients created by the heart.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

well, you see. the answer to your question is quite simple. the thing that is big, powerful, and over 9,000 is your mom.