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'''Phylum''' (plural: ''phyla'') is a term in biological [[taxonomy]], the classification and grouping of species. A [[kingdom]] is made up of phyla, and a phylum in turn is made up of classes. The plants or animals within a phylum exhibit enormous diversity, yet have fundamental similarities in body plan and physiology.  

'''Phylum''' (plural: ''phyla'') is a term in biological [[taxonomy]], the classification and grouping of species. A [[kingdom (biology)|kingdom]] is made up of phyla, and a phylum in turn is made up of classes. The plants or animals within a phylum exhibit enormous diversity, yet have fundamental similarities in body plan and physiology.  

For example, the phylum [[Chordata]] includes all of the vertebrates: mammals, birds, fish, frogs, and many others—most of what we commonly think of as animals. Despite the enormous variety, almost all chordates have backbones, a nervous system, a heart, and bilateral symmetry.

For example, the phylum [[Chordata]] includes all of the vertebrates: mammals, birds, fish, frogs, and many others—most of what we commonly think of as animals. Despite the enormous variety, almost all chordates have backbones, a nervous system, a heart, and bilateral symmetry.