All the vertebrates are chordates but all the chordates are not vertebrates why
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The characteristic features of the phylum, CHORDATA, INCLUDE the presence of a notochord and paired pharyngeal gill slits. In sub-phylum VERTEBRATA, the notochord present in embryos gets replaced by a cartilaginous or bony vertebral column in adults. THUS, it can be said that all vertebrates are CHORDATES but all chordates are not vertebrates.