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Q: The approximate percentages of oxygen, nitrogen, and carbon dioxide in pure air on the Earth's atmosphere are:

A. 0.03%, 21% and 78% respectively
B. 78%, 21% and 0.03% respectively
C. 21%, 78% and 0.03% respectively
D. 21%, 7.8% and 0.03% respectively
Answer» D. 21%, 7.8% and 0.03% respectively


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