Explain briefly how the percentage by volume of Oxygen and Carbon dioxide in the air is maintained at about 21% and 0.03% respectively.
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Balance cycle of carbon dioxide and oxygen in atmosphere is photosynthesis. The balance of carbon dioxide and oxygen in atmosphere is mainly maintained by the oxygen released and carbon dioxide consumed during photosynthesis by plants. It is also regulated by the carbon dioxide released by animals during respiration.
Thus, the correct answer is 'Photosynthesis.'
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