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Which describes one of oxygen's roles in Earth’s atmosphere? 1.allows fuels to burn. 2.forms clouds that produce rain. 3.is the gas that animals exhale. 4.is used by plants to produce food.
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Which describes one of oxygen's roles in Earth’s atmosphere?

1.allows fuels to burn.
2.forms clouds that produce rain.
3.is the gas that animals exhale.
4.is used by plants to produce food.

User Dalef
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Answer: a

Step-by-step explanation:

User Sunteen Wu
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