Which statement about air composition is correct?

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Multiple Choice

Which statement about air composition is correct?

Explanation:
Air is made up mainly of two gases in the dry atmosphere: nitrogen and oxygen, with oxygen comprising about 21% of the mix. The rest are trace gases, and carbon dioxide is only around 0.04%, not 0.1%. So the statement that oxygen is 21% matches the actual composition of dry air. The other figures differ from these standard proportions: nitrogen is about 78%, not 75%; oxygen isn’t typically 23%.

Air is made up mainly of two gases in the dry atmosphere: nitrogen and oxygen, with oxygen comprising about 21% of the mix. The rest are trace gases, and carbon dioxide is only around 0.04%, not 0.1%. So the statement that oxygen is 21% matches the actual composition of dry air. The other figures differ from these standard proportions: nitrogen is about 78%, not 75%; oxygen isn’t typically 23%.

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