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Priyanka Tomar • 35.28K Points
Coach Physics

Q. 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
  • Correct Answer - Option(C)
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  • Filed under category Physics

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