The composition of Earth's atmosphere by volume is ________ nitrogen, ________ oxygen, 0.93% argon, 0.039% carbon dioxide, around 1% water vapor, and small amounts of other gases.
A) 78%; 21%
B) 68%; 31%
C) 88%; 11%
D) 49%; 49%
E) 22%; 77%
Correct Answer:
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