Which of the following morphological innovations is found in the ancestor that led to vertebrates?

Question

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The notochord, a flexible rod-like structure, is a defining feature of the chordates, the phylum that includes vertebrates. This innovation likely played a role in the evolution of the vertebrate backbone, but true vertebrae did not evolve until later in vertebrate history. Bone and neural crest cells are also important innovations in vertebrates, but they emerged later in the evolutionary lineage.

Which of the Following Morphological Innovations Is Found in the Ancestor