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Why is there oxygen in the earth's atmosphere?

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Anonymous

∙ 12y ago
Updated: 8/20/2019

The oxygen is the product of photosynthesis. Plants and algae use the energy of sunlight to turn water and carbon dioxide into sugar and oxygen. The plants use the sugar as food and turn some into cellulose to make cell walls. Oxygen is released into the atmosphere as a byproduct.

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∙ 12y ago
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How much of the earths atmosphere is made up of nitrogen and oxygen?

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