Avian vs. Mammalian Respiratory System:
How does the respiratory system in birds differ from the mammalian respiratory system?
a) The respiratory system in birds allows exchange of fresh air and stale air in one breath, whereas the mammalian system requires two breaths for this exchange.
b) The respiratory system In birds is less efficient than the mammalian respiratory system.
c) The respiratory system in birds is unidirectional, whereas the mammalian respiratory system is bidirectional.
d) The respiratory system in birds uses air sacs in place of the lungs found in the mammalian respiratory system.
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