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Nutrition
Prokaryotes are usually classified according to what they eat. Autotrophs metabolize the chemicals in their own bodies. They can harvest light (photosynthesis) or various nonliving substances (chemiosynthesis). Heterotrophs eat substances made by autotrophs. Parasites trap their energy form the tissues of the host cell they live on. Saprobes (decomposers) get their energy form dead and decaying materials.