The surface of air sacs is ..., meaning damp.
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The surface of air sacs is ..., meaning damp
The surface of air sacs is ..., meaning damp.
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Answer:
Air sac, any of the air-filled extensions of the breathing apparatus of many animals. Air sacs are found as tiny sacs off the larger breathing tubes (tracheae) of insects, as extensions of the lungs in birds, and as end organs in the lungs of certain other vertebrates.
Explanation:
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