http://en.wikipedia.org/wiki/Anatomy
All vertebrates have a similar basic body plan and at some point in their lives, (mostly in the embryonic stage), share the major chordate characteristics; a stiffening rod, the notochord; a dorsal hollow tube of nervous material, the neural tube;pharyngeal slits; and a tail posterior to the Anus.
All vertebrates have a similar basic body plan and at some point in their lives, (mostly in the embryonic stage), share the major chordate characteristics; a stiffening rod, the notochord; a dorsal hollow tube of nervous material, the neural tube;pharyngeal slits; and a tail posterior to the Anus.
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