what is the difference between C3 and C4 pathway ?

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C3 - Fixes carbon from C02 into a 3 carbon sugar (3-phospoglycerate)    

C3 plants require less ATP for carbon fixation. Both proccesses were evolutionary devices to allow plants to live in different environments.

C4 - Fixes carbon from CO2 into a 4 carbon sugar,  

C4 plants live in adverse environments, eg in the desert.

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