Answer:
In the environment the percentage of the gases like
oxygen, nitrogen and carbon dioxide is maintained by their cyclic flow.
The oxygen cycle, nitrogen cycle and carbon cycle
respectively operate continuously in the nature by the constant interaction
between the biotic and abiotic components of the biosphere. These interactions
consist of a transfer of matter and energy between the different components of
the biosphere.
Thus, their levels in the atmosphere is maintained
constantly up to required limit.
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