Archaea

Archaea, singular archaeon, is a domain and a kingdom of single-cell prokaryotes. These microbes lack a nucleus and other organelles. Archaea possesses genes and metabolic pathways that are more closely related to eukaryotes than to bacteria. Reproduction is asexual by binary fission, fragmentation, or budding. While some Archaea are extremophiles, they are numerous as oceanic plankton, and occur in the human gut. For more information, visit the Wikipedia entry. Get back to Other Kingdoms

Archaeon