Specific characteristics in chordate life cycle:
a. Dorsal, hollow nerve chord: bundle of nerve tissues running along the body
b. Notochord: flexible rod running along the body
Which of the following structures is not required to be a chordate?
B) Dorsal, hollow nerve cord
C) Pharyngeal slits or clefts
D) Muscular, post-anal tail
E) Calcified spinal cord
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