What is the combined percentage of nitrogen and oxygen in dry air?

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Multiple Choice

What is the combined percentage of nitrogen and oxygen in dry air?

Explanation:
Dry air is dominated by two gases: nitrogen and oxygen. In the atmosphere, nitrogen makes up about 78% and oxygen about 21%. When you add these together, you get roughly 99% of dry air. The remaining ~1% comes from trace gases like argon, carbon dioxide, neon, and others. So the best answer is the one that states about 99%. The other numbers correspond to just nitrogen (around 78%), just oxygen (around 21%), or the small amount of trace gases, not their sum.

Dry air is dominated by two gases: nitrogen and oxygen. In the atmosphere, nitrogen makes up about 78% and oxygen about 21%. When you add these together, you get roughly 99% of dry air. The remaining ~1% comes from trace gases like argon, carbon dioxide, neon, and others. So the best answer is the one that states about 99%. The other numbers correspond to just nitrogen (around 78%), just oxygen (around 21%), or the small amount of trace gases, not their sum.

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