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Nitrogen makes up 78.09%, oxygen makes up 20.95%, argon makes up 0.9340%, and the rest is very small amounts of carbon dioxide, neon, helium, methane, krypton, hydrogen, nitrous oxide, carbon monoxide, xenon, ozone, nitrogen dioxide, iodine, and ammonia.

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Q: Which of 3 gases make up 99.9 percent air?
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