3. Why does oxygen diffuse into the blood from an alveolus in the lungs? A The oxygen concentration in the alveolus is greater than the carbon dioxide concentration in the blood. B The oxygen concentration

3. Why does oxygen diffuse into the blood from an alveolus in the lungs?

A The oxygen concentration in the alveolus is greater than the carbon dioxide concentration in
the blood.

B The oxygen concentration in the alveolus is greater than in the blood.

C The oxygen concentration in the blood is greater than in the alveolus.

D The oxygen concentration in the blood is greater than the carbon dioxide concentration in the alveolus.

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