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they are organism which produce their own food
An organism that is able to form nutritional organic substances from simple inorganic substances such as carbon dioxide
they can't synthesis their own food.
Heterotrophs cannot produce organic compounds from inorganic sources and therefore rely on consuming other organisms in the food chain
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They are the animals that produce organic compounds from simple substances with the help of environment (using energy). They are also called producers because they help in food chain. Autrophs also reduce use of carbon-di-oxide.They can produce their own food.
Heterotrophs are animals which cannot synthesise their own  food.

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