Why dosn't the level of oxygen in the atmospher decrease
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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.
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Answer: 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 atmosphere produce O² in return. it is this process which keeps the oxygen level fairly constant.
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