% of oxygen is present in the atmosphere.
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Oxygen makes up 21% of the atmosphere. It is highly reactive and forms compounds with numerous other chemicals and is necessary for respiration in living things. Oxygen is a colourless, odourless, tasteless gas composed of the simple diatomic molecule O2.
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Explanation:
The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
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