Which of the microbial populations listed below is thought to have evolved earliest based on metabolism studies of the geological record?

Name: Which of the microbial populations listed below is thought to have evolved earliest based on metabolism studies of the geological record?
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Anaerobic oxidation-reduction bacteria are believed to have evolved earliest because early Earth had a reducing atmosphere with little to no oxygen, favoring anaerobic metabolic processes.

Which of the Microbial Populations Listed Below Is Thought to Have