Percentage of oxygen present in inhaled air in human beings is approximately

0.04%

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77%

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21%

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Solution

The correct option is D 21%
Inhaled air contains more oxygen used to create energy and less carbon dioxide. It contains 21% oxygen, 0.04% carbon dioxide and 79% Nitrogen.

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The percentage of oxygen in inhaled air is 21%.

O_{2}

_{2}

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