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B
Nerve cord
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C
Mesoderm
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D
Endoderm
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Solution
The correct option is B Notochord
Vertebral column is also known as backbone. It lies in the mid-dorsal region of the neck and trunk and is made up of 26 serially arranged units called vertebrae. It extends from the base of the skull and constitute the main framework of the trunk. It is derived from notochord. Notochord is an elastic, solid, ensheathed rod-like structure of vacuolated turgid cells which is present throughout the life.