Which organisms would most likely be present on the bottom or closest to the actual surface of a complex microbial biofilm?

Name: Which organisms would most likely be present on the bottom or closest to the actual surface of a complex microbial biofilm?
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Anaerobic sulfate-reducing bacteria are typically found at the bottom of microbial biofilms, as they rely on the consumption of sulfate ions, which tend to accumulate in areas of low oxygen concentration.

Which Organisms Would Most Likely Be Present on the Bottom