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14-12-2018
Biology

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how oxygen and carbon dioxide are produced

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14-12-2018

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

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egipson egipson

14-12-2018

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

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