________ is an aerobic chemolithotrophic process that ultimately oxidizes ammonia to nitrate, whereas ________ is a form of anaerobic respiration involving the oxidation of an organic compound using an oxidized nitrogenous compound, such as nitrate, as the terminal electron acceptor.
A. Denitrification; nitrification
B. Ammonification; denitrification
C. Nitrification; denitrification
D. Ammonification; nitrification
Answer: C
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