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Question
The earth's atmosphere, which we refer to as air, is a mixture of approximatelya. 78% oxygen, 21% nitrogen, and less than 1% carbon dioxide.
b. 78% nitrogen, 21% oxygen, and less than 1% argon.
c. 78% oxygen, 21% carbon dioxide, and less than 1% helium.
d. 78% oxygen, 21% water vapor, and less than 1% ozone.
Answer
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