What is the function of air sacs in birds?

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Question

(A) Birds possess air sacs that are connected to their lungs. These air sacs serve multiple functions,but their primary role in the context of flight

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To reduce body weight

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(A) Birds possess air sacs that are connected to their lungs. These air sacs serve multiple functions,but their primary role in the context of flight is to reduce the overall body density and weight,making it easier for the bird to fly. Additionally,they provide a continuous supply of oxygen to the lungs,which is essential for the high metabolic demands of flight.

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