chemosynthesis
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/ˌkiːməʊˈsɪnθəsɪs/
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/ˌkiːməʊˈsɪnθəsɪs/
A process where certain organisms make their own food using chemicals and energy from their environment, instead of sunlight.
Deep-sea creatures like tube worms rely on chemosynthesis to survive in the dark ocean depths.