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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]] 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, bilateral symmetry, and other features in common.

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.

The phylum [[Arthropoda]] includes insects, beetles, centipedes, spiders, lobsters, and many others. They are fundamentally similar to each other and fundamentally different from chordates. For example, arthropods don't have bones inside them, but instead have a stiff shell-like [[exoskeleton]] on their outside.  

The phylum [[Arthropoda]] includes insects, beetles, centipedes, spiders, lobsters, and many others. They are fundamentally similar to each other and fundamentally different from chordates. For example, arthropods don't have bones inside them, but instead have a stiff shell-like [[exoskeleton]] on their outside.