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CBSE Class 9 Answered

why doesn,t the level of oxygen in the atmosphere decrease
Asked by aryay7355 | 11 May, 2022, 08:51: PM
Expert 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. It is this process which keeps the oxygen levels fairly constant.
Answered by Shiwani Sawant | 12 May, 2022, 09:01: AM
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