Once the top-level taxonomic classification of life on Earth, Kingdoms are now subordinate to the Three Domains. Note that virii are not included here. Many biologists feel that viruses are not "alive".

Refinements on the Five Kingdom model divide Monera into the kingdoms of Eubacteria and Archaebacteria, Protista into Archaezoa and Protozoa, and add a whole new kingdom of Chromista, for a total of 8 kingdoms.

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