A bacterium that uses CO₂ as an electron source but CANNOT use it as a carbon source is considered a mixotroph.

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A mixotroph is a microorganism that can use both organic and inorganic sources of carbon and energy. In the case of a bacterium that uses CO₂ as an electron source but cannot use it as a carbon source, it would be classified as a mixotroph because it can utilize both organic and inorganic sources of carbon.

A Bacterium That Uses CO₂ as an Electron Source but CANNOT