(B) The axis ($C2$ vertebra) is a cartilaginous bone. Cartilaginous bones (also known as replacing bones or endochondral bones) are formed by the repl

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(B) The axis ($C2$ vertebra) is a cartilaginous bone. Cartilaginous bones (also known as replacing bones or endochondral bones) are formed by the replacement of a pre-existing cartilage model by bone tissue. Most of the bones in the human skeleton,including the vertebrae,are cartilaginous bones.