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Best Answer: Chordata refers to the presence of a nerve chord running from the head to the back, which may or may not be accompanied by vertebrae. All animals with ...
Characteristics of Chordata. Animals in the phylum Chordata share four key features that appear at some stage during their development (often, only during embryogenesis) (: In chordates, four common features appear at some point during development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.