Dry air contains roughly (by volume) 78% nitrogen, 21% oxygen, 0.93% argon, 0.038% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. It is hard to say what is the most important however. Nitrogen makes up the biggest portion of Earths air. Nitrogen plays a very important part in living things, however, atmospheric Nitrogen is not usable by most living things. Almost every living thing need oxygen to live. Plants need CO2 and CO2 is an important greenhouse gas which helps keep Earth’s temperature comfortable (until recently when CO2 started to get too prevalent). Life as we know it wouldn’t exist without Earth’s particular mixture of air and so I would say it is all very important.
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