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Agata [3.3K]
3 years ago
14

Someone Please Help!! ASAP!!!!!!

Biology
1 answer:
love history [14]3 years ago
6 0

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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