Which of the following organisms neither have notochord nor vertebral column in the adult stage?

Which of the following organisms neither have notochord nor vertebral column in the adult stage?

Q. Which of the following organisms neither have notochord nor vertebral column in the adult stage?

A.            Cephalochordates

B.            Herdmania

C.            Petromyzon

D.            Bdellostoma

Answer: Herdmania

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