Question

how the oxygen constituent of the atmosphere ​

Answer 1

Answer:

According to NASA, the gases in Earth's atmosphere include: Nitrogen — 78 percent. Oxygen — 21 percent. ... Carbon dioxide — 0.04 percent.

Explanation:

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Answer 2

Answer:

Composition of air the gases in Earth's atmosphere include: Nitrogen — 78 percent. Oxygen — 21 percent. ... Carbon dioxide — 0.04 percent.