This kingdom consists of one-celled prokaryotes; includes bacteria and cyanobacteria.

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Single-celled prokaryotes without a nucleus belong to a kingdom that includes bacteria and cyanobacteria. These organisms have simple cell structures, with genetic material floating in the cytoplasm rather than being enclosed in a nucleus, and they lack membrane-bound organelles. That makes Monera the best fit, since it groups these prokaryotic, unicellular organisms like bacteria and cyanobacteria. Protists and Fungi, by contrast, are eukaryotes with cells that contain a nucleus and other organelles, and Archaea are prokaryotes but are classified separately from bacteria in modern taxonomy.