How is the percentage of oxygen maintained at 21%
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Earlier oxygen Is maintained by green plants.
But now a day 21% oxygen is not maintained as the percentage of oxygen is slowly decreasing because of pollution.
But now a day 21% oxygen is not maintained as the percentage of oxygen is slowly decreasing because of pollution.
Answered by
1
Even though humans and animals respire or take in oxygen, plants give out oxygen. This helps reduce the extent to which oxygen is reducing.
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