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46. Yawning may be caused by A. high oxygen concentration in the blood. B. high lactic acid concentration in the blood. C. high carbon dioxide concentration in the blood. D. high urea concentration in
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46. Yawning may be caused by

A. high oxygen concentration in the blood.
B. high lactic acid concentration in the blood.
C. high carbon dioxide concentration in the blood.
D. high urea concentration in the blood.​

User Monad
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1 Answer

12 votes
None of these seem to be correct, but it seems c is due to a disproved myth that essentially is the only thing close to an answer.
User Geoffrey McGrath
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