Why do birds not have respiratory trouble at the time of flying at high altitud

Why do birds not have respiratory trouble at the time of
flying at high altitude?
(a) Their lungs are very large (b) They fly inactively (c)
They have extra air sacs (d) They use less oxygen

Question Posted / yeadorele

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Why do birds not have respiratory trouble at the time of flying at high altitude? (a) Their lungs ..

Answer / sush21

They have extra air sacs

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