The percentage of oxygen in the air does not change because

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Oxygen is not used in any natural process.

Oxygen is used up in natural processes and is negligible.

Oxygen used up in some natural process is renewed by another natural process.

Oxygen used up in a natural process is replenished by the ozone layer.

answer is C.

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Detailed Solution

The percentage of oxygen in the air does not change because oxygen used up in some natural process is renewed by another natural process.
Another natural process renews oxygen used up in some natural process. The percentage of oxygen does not change in the atmosphere because the oxygen used in respiration and combustion is replaced by the oxygen generated by the plants during photosynthesis. So, if one process uses oxygen, the other replaces it in the atmosphere.

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