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An organism is an autotroph if it can make it's own food. Autotrophs can be plants, algae, or bacteria. For example, plants use sunlight (photosynthesis) to create their own food. These autotrophs are called phototrophs. Other organisms oxidize inorganic compounds, such as hydrogen sulfide, elemental sulfur, ammonium and ferrous iron to create their own food. These autotrophs are called lithotrophs.

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