Linnaeus s System of Classification Several different classes make up a phylum (plural: phyla) A phylum includes many different organisms that nevertheless share important characteristics The class Mammalia is grouped with birds (class Aves), reptiles (class Reptilia), amphibians (class Amphibia), and all classes of fishes into the phylum Chordata All these organisms share important features of their body plan and internal functions Finally, all animals are placed in the kingdom Animalia The kingdom is the largest and most inclusive of Linnaeus s taxonomic categories Linnaeus named two kingdoms, Animalia and Plantae
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