Why do birds not have respiratory trouble at the time of flying at high altitude ? Options: A . &nbspTheir lungs are very large B . &nbspThey fly inactively C . &nbspThey have extra air sacs D . &nbspThey use less oxygen

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

Question

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

Options:

A . Their lungs are very large

B . They fly inactively

C . They have extra air sacs

D . They use less oxygen

Answer: Option C

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