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Notochord is

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a well-developed structure located in the trunk region of Balanoglossus

a rod-like structure derived from the mesoderm

present only in the larval tail of Branchiostoma

replaced by a bony vertebral column in Petromyzon

answer is B.

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Detailed Solution

The notochord is a mesodermal rod-like structure formed on the dorsal side during embryonic development in chordates.

In Branchiostoma, the notochord extends from head to tail region.

In cyclostomes (e.g., Petromyzon), the cranium and the vertebral column are cartilaginous.

Balanoglossus (Hemichordata) has stomochord (buccal diverticulum) but not notochord.

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