Domain, Separates prokaryotes from eukaryotes, Most inclusive of all taxa, Kingdom, Separates plants from animals, Next to domain, the most inclusive taxon, All animals belong to this taxon., Phylum, Distinguishes sponges from cnidarians, Echinoderms are our (chordates) closest relatives, Arthropods make up the most numerous of this taxon., Class, Five major groups under Phylum Chordata, Separates insects from crustaceans & arachnids, Order, The different groups of mammals, More exclusive than class, Family and Genus, More exclusive than order, More inclusive than species, Species, Most exclusive taxon, Sapiens in Homo sapiens, A horse and a donkey cannot produce a fertile mule.

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