What are the three structures shared by every chordate that characterize the group?

What are the three structures shared by every chordate that characterize the group?
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All beings of the phylum Chordata have branchial clefts in the pharynx (in some species present only in the embryo), notochord (substituted by the spinal column in vertebrates) and dorsal neural tube. Image Diversity: branchial clefts notochord dorsal neural tube
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