(C) The phylum $Chordata$ is primarily characterized by the presence of a notochord at some stage in their life cycle. While the vertebral column is a

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(C) The phylum $Chordata$ is primarily characterized by the presence of a notochord at some stage in their life cycle. While the vertebral column is a feature of $Vertebrata$ (a subphylum of $Chordata$),the notochord is the fundamental diagnostic feature that defines the entire phylum $Chordata$.