The benefit provided by all hearts with two atria is
A. not all the blood has to pass through both sides of the heart.
B. that there are two muscular regions for pumping blood out of the heart to different organs.
C. that blood is pumped into body tissues at high pressure.
D. complete separation of oxygenated and deoxygenated blood.
E. there is an extra place to store blood when the animal is at rest.
Answer: C
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