Answer:
Nitrogen represents 78% of the atmosphere, oxygen 21%.
Explanation:
The atmosphere is composed of a mixture of many different gases, which are found in different amounts. The permanent gases whose percentages do not change are nitrogen, oxygen, and argon.
Nitrogen represents 78% of the atmosphere, oxygen 21% and argon 0.9%. Other gases such as carbon dioxide, nitrous oxides, methane, and ozone represent a low percentage of the composition in the atmosphere.
Ultimately nitrogen and oxygen account for approximately 99% of the gases in the atmosphere.
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