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    Question

    Why do brads not have respiratory trouble at the time

    of flying at high all?
    A Their lungs are very large Correct Answer Incorrect Answer
    B They fly inactively Correct Answer Incorrect Answer
    C They have extra air sacs Correct Answer Incorrect Answer
    D They use less Correct Answer Incorrect Answer

    Solution

    The avian respiratory system delivers oxygen from the air to the tissues and also removes carbon dioxide. In addition, the respiratory system plays an important role in thermoregulation (maintaining normal body temperature). The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus nine air sacs that play an important role in respiration (but are not directly involved in the exchange of gases).

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