Mammalian lungs have an enormous number ...

Mammalian lungs have an enormous number of minute alveoli (air sacs). This is to allow

A

more space for increasing the total volume of expired air

B

more smface area for diffusion of gases

C

more spongy texture for keeping lungs in proper shape

D

more nerve supply to keep the organs working more efficiently

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The correct Answer is:

B

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