Methanogens use different substrates and can thus be classified differently depending on the metabolic pathway and the form of carbon they use. a. How would you categorize methanogens that use CO2 and H2 to create methane? b. How would you categorize methanogens that use methyl based C source or CH3OH and H2 to create methane? c. Alternatively, methanotrophs EAT CH4 at the aerobic/anaerobic interface and produce CO2. What would you categorize these organisms? Explain your answer.