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A: Autotrophs and heterotrophs differ in the way they obtain energy; autotrophs make their own energy whereas heterotrophs must consume other organisms to get their energy. Autotrophs are the producers of ecosystems, which means they are the providers of energy for the rest of the organisms within the ecosystem. Continue Reading.
Autotrophs can be photoautotrophs or chemoautotrophs. Phototrophs use light as an energy source, while chemotrophs use electron donors as a source of energy, whether from organic or inorganic sources; however in the case of autotrophs, these electron donors come from inorganic chemical sources.