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lockshernostaw
they both have opposite equations if you look at them closer. What one produces the other needs. 
mayormaynotbe
Hi there.

Photosynthesis takes energy from the sun & carbon dioxide to make food & oxygen.

Cellular respiration uses the food & oxygen (the result of photosynthesis) to make carbon dioxide.

Photosynthesis uses the carbon dioxide from cellular respiration, which uses the food & oxygen from photosynthesis.

Hope this helped you!