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

User Max Sherbakov
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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.

Step-by-step explanation:

User Gene Vincent
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