The Linnaean Taxonomic Hierarchy
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The Linnaean system classifies organisms into nested categories: domain, kingdom, phylum, class, order, family, genus, and species.
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A dog's classification moves from the broad domain Eukarya through kingdom, phylum, and class to the genus Canis and species lupus.
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Each level nests inside the one above it — a phylum places an organism within one domain and kingdom, not alongside them.