The oxygen content of dry air in the atmosphere
A)varies depending on the altitude.
B)is about 21.0%.
C)is inversely proportional to the partial pressure of oxygen.
D)is about 0.03%.

Name: The oxygen content of dry air in the atmosphere A)varies depending on the altitude. B)is about 21.0%. C)is inversely proportional to the partial pressure of oxygen. D)is about 0.03%.
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The oxygen content of dry air in the atmosphere is about 21.0%.

The Oxygen Content of Dry Air in the Atmosphere