If you were to analyze the deepest layer of a microbial mat along a coastline (i.e., the layer farthest away from the surface of the water), you would find that H₂S levels sharply increase, as do the numbers of chemoautotrophic microorganisms.

Question

Quizplus · Accepted Answer

The deepest layer of a microbial mat along a coastline is typically anoxic, and thus rich in hydrogen sulfide (H₂S). Chemoautotrophic microorganisms are adapted to thrive in these conditions, utilizing the hydrogen sulfide as an energy source for carbon fixation. Therefore, H₂S levels and chemoautotrophic microorganisms increase in the deepest layer of a microbial mat.

If You Were to Analyze the Deepest Layer of a Microbial