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How oxygen and carbon dioxide are produced
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How oxygen and carbon dioxide are produced

User Sliceoftime
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Oxygen is produced by trees through photothnthesis and carbon dioxide is prodeced by mammals and other things breathing it out or burning fule.

User Moseleyi
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Oxygen is produced by photosynthesis. Carbon dioxide is produced by humans or animals inhaling oxygen and relapsing carbon dioxide
User Daniel Duong
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