Which of the following is characteristic of all vertebrates?

Question

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All vertebrates have a skull and a backbone consisting of vertebrae, which are defining characteristics of this animal group. Calcified skeleton and four legs are present in some vertebrates but not all, for example, fish and snakes don't have four legs. Likewise, a hinged jaw is present only in gnathostomes (jawed vertebrates), while lungs or lung derivatives are present in some groups of vertebrates like tetrapods, but not all, like fish.

Which of the Following Is Characteristic of All Vertebrates