(C) The $atlas$ vertebra is the first cervical vertebra $(C1)$,which is unique because it lacks a $centrum$ (body). The $axis$ vertebra is the second

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(C) The $atlas$ vertebra is the first cervical vertebra $(C1)$,which is unique because it lacks a $centrum$ (body). The $axis$ vertebra is the second cervical vertebra $(C2)$,which possesses a $centrum$ and a characteristic $odontoid$ process (dens). Therefore,the $centrum$ is not common to both.