Question 39
Why does the percentage of gases like oxygen, nitrogen and carbon dioxide remain almost the same in the atmosphere?

In the environment, the percentage of the gases like oxygen, nitrogen and carbon dioxide is maintained by their cyclic flow. Through biogeochemical cycling, there is repeated circulation of biogenetic nutrients between abiotic and biotic components of the environment. This interaction consists of a transfer of matter and energy between the different components of the biosphere. Thus, the percentage of gases like oxygen, nitrogen and carbon dioxide remain almost the same in the atmosphere.