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Photosynthesis is the fundamental process by which plants use sunlight to create their own food. absorb water through roots and carbon dioxide the air small pores their . Inside the 's cells, a green pigment called captures from sun. This energy converts the water and carbon dioxide into glucose, a type of sugar, for nourishment. As a byproduct of this vital process, plants release oxygen into the atmosphere, which most living organisms need to breathe.