What Is the MOST Significant Fact About the Oxygen in Earth's

What is the MOST significant fact about the oxygen in Earth's atmosphere?

A) Oxygen is the most abundant gas in Earth's atmosphere.
B) Oxygen is very chemically reactive.
C) The oxygen in Earth's atmosphere exists not as pure oxygen, but only in chemical combination with hydrogen in water, carbon in carbon dioxide, and nitrogen in nitrogen oxides.
D) Oxygen is the heaviest molecule in Earth's atmosphere.

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