Bacteria and Archaea
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Prokaryotes belong to two of the three domains of life: Bacteria and Archaea. Prokaryotes are single-celled organisms that contain no nucleus. Prokaryotes of the domain Bacteria live virtually everywhere whereas many prokaryotes of the domain Archaea live only in the most extreme conditions such as in hot springs or in Utah's Great Salt Lake. Organisms of the domain Eukarya include the eukaryotes, organisms that have cells with nuclei.