<P> In biology, kingdom (Latin: regnum, plural regna) is the second highest taxonomic rank, just below domain . Kingdoms are divided into smaller groups called phyla . Traditionally, some textbooks from the United States used a system of six kingdoms (Animalia, Plantae, Fungi, Protista, Archaea / Archaebacteria, and Bacteria / Eubacteria) while textbooks in countries like Great Britain, India, Greece, Australia, Latin America and other countries used five kingdoms (Animalia, Plantae, Fungi, Protista and Monera). Some recent classifications based on modern cladistics have explicitly abandoned the term "kingdom", noting that the traditional kingdoms are not monophyletic, i.e., do not consist of all the descendants of a common ancestor . </P> <P> When Carl Linnaeus introduced the rank - based system of nomenclature into biology in 1735, the highest rank was given the name "kingdom" and was followed by four other main or principal ranks: class, order, genus and species . Later two further main ranks were introduced, making the sequence kingdom, phylum or division, class, order, family, genus and species . In 1990, the rank of domain was introduced above kingdom . </P>

Living organisms are divided into how many kingdoms
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