Which of the following sets of metabolic processes can be used by microorganisms but cannot be performed by plants or animals? Select one answer.
(a) CO2 fixation, nitrogen fixation, ammonia assimilation
(b) Nitrification, denitrification, CO2 fixation
(c) Methanogenesis, denitrification, sulfide oxidation
(d) Ammonia assimilation, urea mineralization, oxygenic photosynthesis
(e) Oxygenic photosynthesis, sulfate reduction, sulfide oxidation
