Consider the cladogram representing most of the major categories of animals. what physical characteristic is used to divide the animals into the two main clades?

Kingdom Animalia is divided into seven phyla.  Phylum Chordata includes vertebrates (animals with spinal columns and spinal cords).  The other six phyla are made up of invertebrates (animals without spinal columns and spinal cords).  The presence or absence of a spine is the physical characteristic that is used to divide animals into two main clades.

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