Question

The main advantage of a double circulation of blood in mammal is that
A. There are no capillaries tissues are bathed in blood
B. All parts of the heart share the work
C. Oxygenated and deoxygenated bloods are mixed together thoroughly
D. The blood returns rapidly and more frequently to heart​

Answer 1

Answer:

D. The blood returns rapidly and more frequently to heart.

Answer 2

Answer:

The advantage of a double circulatory system is that blood can be pumped to the rest of the body at a higher pressure.

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