Question

AERIAL. ANIMALS. HOW. BREATHE​

Answer 1

Answer:

And when a bird inhales, air actually leaves its lungs; fresh air enters the lungs as it exhales. ... Gases from the air sacs are sent forward through the lungs again, then through more air sacs into the trachea, and then finally expelled from the body.

Answer 2

Answer:

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In birds, the air flow is one way, through tubes and chambers, rather than two ways, in and out of the lungs, as it is in mammals. And when a bird inhales, air actually leaves its lungs; fresh air enters the lungs as it exhales.

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