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Photosynthesis: The chemical process carried on by green plants (autotrophs) through which light energy is used to produce glucose from carbon dioxide and water (and oxygen is released as a biproduct). Although hundreds of chemical changes occur during photosynthesis, the overall net change is summarized as: 6 CO2 + 6H2O --------> C6H12O6 + 6 O2 This process is necessary in sustaining all life on Earth. |