Based on the characteristics of crenarchaeote archaeons and euryarchaeote archaeons, these organisms likely first evolved in oxygen-poor habitats.

Question

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Crenarchaeote and euryarchaeote archaeons are both capable of living in extreme environments such as hot springs, deep-sea hydrothermal vents, and acidic or alkaline environments. These environments are often oxygen-poor or anoxic, which suggests that these archaeons likely evolved in oxygen-poor habitats.

Based on the Characteristics of Crenarchaeote Archaeons and Euryarchaeote Archaeons