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/ˈhetərəˌträf/ /-trōf/ Noun, pl. heterotrophs 1. An organism which requires an external supply of energy in the form of food as it cannot synthesize its own. ( 2. An organism that cannot fix carbon and uses organic carbon for growth. (   Word origin: From Greek ἕτερος heteros (another, different) and τροφή trophe...

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