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What gas do humans breathe out that plants use for photosynthesis?

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Answer: Photosynthesis and respiration are the two essential processes that allow life to sustain on earth. In a way, they are a cycle — plants help humans breathe by providing us with oxygen, and humans help plants "breathe" by providing them with carbon dioxide.

User Kwirk
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Answer:

carbon dioxide

hope this helped

Step-by-step explanation:

User Novell
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