Which Statement About the Gas Exchange System of Birds Is

Which statement about the gas exchange system of birds is not true?

A) Respiratory gases are not exchanged in the air sacs.
B) A bird can achieve more complete exchange of O₂ from air to blood than humans can.
C) Air passes through birds' lungs in only one direction.
D) The gas exchange surfaces in bird lungs are the alveoli.
E) A breath of air remains in the system for two breathing cycles.

Correct Answer:

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