Biology
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Photosynthesis

What are the roles of oxygen and carbon dioxide in cell respiration and photosynthesis?

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Wiki User
09/13/2011

it's really oxygen and hydrogen that count. the separation of those two from water is photosynthesis and the recombination is respiration.

The function of carbon or carbon dioxide is as a carrier molicule for the hydrogen (there is no free gas in any of the various biological reactions). CO2 plus H is a carbohydrate.

You have to tell more. I will fail in science.