In methane-producing environments large polymers are broken down by a consortium of microbes.This consortium includes:

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In methane-producing environments, large polymers are broken down by a consortium of microbes that include polymer hydrolyzing microbes, fermenters, and methanogens. Obligate aerobic bacteria (choice A) would not be present in a methane-producing environment because methane production is an anaerobic process. Similarly, primary aerobic respiratory microbes (choice D) would not be present because aerobic respiration requires oxygen. Sulfate-reducing microbes (choice E) can be present in certain anaerobic environments, but they are not necessarily involved in methane production. Therefore, the best choice is B.

In Methane-Producing Environments Large Polymers Are Broken Down by a Consortium