All chordates have a notochord. Phylum Chordates include urochordates, cephalochordates, and vertebrates. In vertebrates the notochord is replaced by a rachis (backbone), but the spine isn’t present in protochordates. So in this way, all vertebrates are chordates but not all chordates are vertebrates.
Final Answer :
Hence all vertebrates are chordates but all chordates are not vertebrates.
