The shared characteristic of being prokaryotic, specifically single-celled with a cell wall and lacking a nucleus, presents evidence that Domain Bacteria and Domain Archaea are closely related.
Organisms in both domains are all single-celled with a cell wall and lack a nucleus. This shared characteristic of being prokaryotic is a key piece of evidence that Domain Bacteria and Domain Archaea are closely related as both fall under the category of prokaryotes.
Although differences exist between Archaea and Bacteria, such as genetic and biochemical distinctions, the fundamental similarity of lacking a nucleus places them in the same category of prokaryotes, indicating a close relationship.
Furthermore, the fact that both Archaea and Bacteria include extremophiles, organisms thriving in extreme environments, suggests a shared evolutionary history and supports their close relationship.
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