At some point during development, all members of the ____ phylum have a hollow dorsal nerve cord, a perforated

pharynx, a notochord, and segmented muscles in both the body wall and postanal tail.



a. Hemichordata
b. Echinodermata
c. Cnidaria
d. Arthropoda
e. Chordata


ANSWER: e

Biology & Microbiology

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