Which among the following is the approximate percentage of oxygen in Earth's atmosphere by volume under standard conditions?
21 %
Earth's atmosphere is composed mainly of nitrogen and oxygen, with nitrogen making up about 78% of the volume.
Oxygen, which supports respiration and combustion, makes up approximately 21% of the atmosphere's volume under standard conditions.
The remaining fraction consists of argon, carbon dioxide, and other trace gases.
Hence, the correct answer is 21%.
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