An organism must possess which of the following during at least part of its life cycle to be classified a chordate?
a. ______ Notochord, dorsal solid nerve cord, lungs; b. ______ Vertebrae, dorsal hollow nerve cord, pharyngeal slits; c. ______ Vertebrae, dorsal hollow nerve cord, lungs; d. ______ Notochord, ventral solid nerve cord, lungs; e. ______ Notochord, dorsal hollow nerve cord, pharyngeal slits.
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