Question

Why does oxygen not decrease ?

Answer 1

Answer:

All human beings, plants and animals utilize oxygen present in the atmosphere for respiration. Yet, the percentage of oxygen in the atmosphere is constant for many years and does not decrease because the green plants which are capable of photosynthesis take up CO2 from the atmosphere and produce O2 in return.

Explanation:

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Answer 2

Because humans and animals breathe in oxygen and release carbon dioxide but plant breathe in carbon dioxide and release oxygen . This cycle naver end .

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