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A human's breathing rate can be affected by A. the level of carbon dioxide in the cells. B. the level of oxygen in the blood. C. the acidity of the blood. D. all of the above.
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A human's breathing rate can be affected by

A. the level of carbon dioxide in the cells.
B. the level of oxygen in the blood.
C. the acidity of the blood.
D. all of the above.

User SirHawrk
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A the level of carbon dioxide in the cells
User Shakti Malik
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5 votes
D. All of the above
User Sootah
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