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Question

What is the percentage of oxygen in the air we inhale?



A

 21%

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B

16.4%

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C

18%

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D

20%

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Solution

The correct option is B

 21%


By composition, dry air contains approximately 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Oxygen is approximated to be 21% because it's actual value leans closer to 21%. 


Biology

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