The percentage of oxygen in the atmosphere is % and nitrogen is %.

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Detailed Solution

The percentage of oxygen in the atmosphere is 21% and nitrogen is 78%.
Air is a mixture of several gases. All living beings need air to survive. The components of air are water vapours, oxygen, nitrogen, carbon dioxide, dust and smoke. Air contains about 78% nitrogen, 21% oxygen and 1% other gases which are 0.03% carbon dioxide and other gases. If the percentage of oxygen and nitrogen is reversed, we will die. If the proportion of oxygen were higher, then the atmosphere would be explosive.

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