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Notochord is present only in larval tail among

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Petromyzon

Balanoglossus

Polychaetes

Ascidia

answer is C.

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Detailed Solution

Urochordates have notochord present only in larval tail. Ascidia is a urochordate or tunicate.

Polychaetes are annelids and non-chordates.

Balanoglossus is a hemichordate and non-chordate.

Petromyzon is a vertebrate.

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