An organism that uses carbon dioxide as a carbon source for growth and uses inorganic substances, such as ferrous iron, as an energy source would be classified as a

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An organism that uses carbon dioxide as a carbon source is an autotroph, and one that derives its energy from inorganic substances rather than light is classified as a chemotroph. Therefore, an organism that combines these traits is a chemoautotroph.

An Organism That Uses Carbon Dioxide as a Carbon Source