Photosynthesis is what plants use to make their food. photosynthesis is also the reason we have oxygen because in the photosynthesis process, carbon dioxide, water, and sunlight goes into the plant, and oxygen and glucose comes out!
The primary function of photosynthesis is to convert solar energy into chemical energy and then store that chemical energy for future use. The oxygen that we breath in is a waste product of the photosynthesis process rather than the reason that it happens – which is good for us!
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