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0. 0. Evolution of thePhylum Chordata. Comparative Anatomy of the Vertebrates. 0. THE PHYLUM CHORDATA. I. Unifying Features of Vertebrates A. Generalized body plan1. Diagnostic features - present sometime during the development or life of all Chordates.a. Dorsal, hollow nerve cordb. Pharyngeal gill slitsc. Notochord - originally a cord of living cells; becomes part of the centrum of vertebrates up through primitive reptiles; incorporated into intervertebral discs in birds and mammals.9444

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