au·to·tro·phic adj \ˌȯt-ə-ˈtrō-fik\
: needing only carbon dioxide or carbonates as a source of carbon and a simple inorganic nitrogen compound for metabolic synthesis
: not requiring a specified exogenous factor for normal metabolism
—au·to·tro·phi·cal·ly \-fi-k(ə-)lē\ adverb
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