What do you mean by vertebral column ?
Is vertebrata the only phylum having true vertebral column and internal skeleton ?

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Solution

Vertebral column is a longitudinal skeletal axis of the body. It is the sack of bones that protect spinal cord.
Yes, only the members of subphylum Vertebrata have true bony endoskeleton. They possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult.

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