The chordates share several features which have played a significant role in the evolution of the phylum. Check all of the features that one would use to exclusively classify members of Chordata and not members of Echinodermata. a. a postanal tail during embryonic development
b. pharyngeal pouches during embryonic development
c. an endoskeleton
d. a notochord on the dorsal side of the gut in the early embryo
e. deuterostomic development of the embryo
f. a hollow nerve cord