An organism that cannot make its own food and must eat other organisms or organic matter to survive, like animals and fungi.
From Greek 'hetero-' (different/other) and 'troph-' (to feed), coined in the early 1900s to contrast with 'autotroph' (self-feeding organisms like plants).
The heterotroph-autotroph distinction is one of biology's most important dividing lines: plants are the ultimate recyclers converting sunlight to food, while heterotrophs like you are the ultimate consumers!
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