The vertebral column is cartilaginous in:

Osteichthyes

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Cyclostomes

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Urochordates

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Cephalochordates

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Solution

The correct option is B Cyclostomes
The vertebral column is cartilaginous in cyclostomes, the first vertebrates.
The vertebral column is made up of bones in Osteichthyes.
The vertebral column is absent in urochordates and cephalochordates as both are invertebrates, belonging to the phylum Chordata.

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