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

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

Breathing and Exchange of Gases

Solution:

The number of alveoli in the human lungs has been estimated to be approximately $300$ million. This enormous number of alveoli are meant to increase surface area of lungs for diffusion of gases,