- A Aerobic heterotrophs
- B Sulfate-reducing bacteria
- C Methanogenic archaea
- D Lactic acid bacteria
Correct answer: C. Methanogenic archaea
Explanation: Methanogenic archaea (methanogens) are responsible for the final step of anaerobic digestion - converting acetate and H2/CO2 into methane (CH4) in sludge digesters.
Concept context
Microorganisms in food, medicine, sewage treatment, biocontrol, and biofertilizers