What is the composition of air?

Answer

Air is composed of gases with nitrogen being the most abundant gas at 78.09%. The second most abundant gas is oxygen at 20.95% and is followed by argon which is 0.93%. Carbon dioxide is 0.038% and the remaining gases such as neon, helium, krypton, xenon and hydrogen occupy less than 0.002% each.
1 Additional Answer
In the air, there are may gases. The two most common that are specifically needed are oxygen and nitrogen to be used by animals and plants, respectively.
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