Question

question 9
where are methanogens found?
hot dry places with no oxygen
extreme environments
in water

Explanation:

Methanogens are archaea that produce methane as a metabolic by - product. They are anaerobic and often found in extreme environments such as swamps, marshes, the guts of ruminants, and hot springs. The first option of hot dry places with no oxygen is too specific as they are not only in hot dry anoxic places. Just saying in water is also too general as not all water has methanogens. Extreme environments is the most comprehensive and accurate answer as it encompasses the various habitats where they are found.

Answer:

extreme environments