Question

$why \: \: doesn t \: the \: level \: of \: o2 \: in \: the \: atmosphere \: decrease$
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Answer 1

Answer:

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

Answer:

Oxygen levels are decreasing globally due to fossil-fuel burning. The changesare too small to have an impact on human health, but are of interest to the study of climate change and carbon dioxide. Atmospheric oxygen levels have declined over the past 1 million years, although not nearly enough to trigger any major problems for life on Earth, a new study finds. The new estimates suggest that atmospheric oxygen levels have fallen by 0.7 percent over the past 800,000 years.

Explanation:

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