Why does the percentage of gases like oxygen, nitrogen and carbon dioxide remain almost the same in the atmosphere?

A.VERIFIED ANSWERfact-checked by tutors

These gases are used by human beings for their growth and development. But these are returned back to environment in one or other form. This process of using natural resources and giving them back to nature is called as Bio-Geo Chemical cycle. Because of Bio-Geo Chemical cycle percentage of gases like oxygen, nitrogen and carbon dioxide remain almost the same in the atmosphere.

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