stephanyare0120 stephanyare0120

24-09-2021
Biology

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what trend do you notice about the relative amount of oxygen in the atmosphere?

Respuesta :

aide035878 aide035878

26-09-2021

Answer:

The proportion of oxygen went up because of photosynthesis by plants. The proportion of carbon dioxide went down because: it was locked up in sedimentary rocks (such as limestone) and in fossil fuels. it was absorbed by plants for photosynthesis.

Explanation:

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