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Chemosynthesis: A type of autotropic nutrition in which organisms called (chemoautotrophs) synthesize organic matter using energy derived from the oxidatio of inorganic chemicals rather than using sunlight.
Heterosynthesis: It is also known as photosynthetic autotrophic nutrition. It is a chemical process performed by green plants, algae and certain bacteria which synthesize organic compounds fron carbon dioxide and water in the presence of sunlight.
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