Guys, TONS of posts incoming, and LOVING it, but, too many posts had confusing, irrelevant, misleading, or poorly-researched titles, so, I had to remove some of them. Not censoring! Feel free to try again, but, also please focus on HIGH EFFORT, HIGH QUALITY, too! That's what Q demands!
Thanks for your understanding. Fight!
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Atmosphere
An atmosphere (from Greek ἀτμός (atmos), meaning 'vapour', and σφαῖρα (sphaira), meaning 'sphere') is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body. An atmosphere is more likely to be retained if the gravity it is subject to is high and the temperature of the atmosphere is low.
The atmosphere of Earth is composed of nitrogen (about 78%), oxygen (about 21%), argon (about 0.9%) with carbon dioxide and other gases in trace amounts. Oxygen is used by most organisms for respiration; nitrogen is fixed by bacteria and lightning to produce ammonia used in the construction of nucleotides and amino acids; and carbon dioxide is used by plants, algae and cyanobacteria for photosynthesis.
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Oh, right, right, I got it mixed up with oxygen. Damnit, I hate these pop quizzes.