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Which one of the following statements is...

Which one of the following statements is totally wrong about the occurrence of notochord, while the other three are correct?

A

It is absent throughout life in humans from beginning

B

It is present throughout life in Amphioxus

C

It is present only in larval tail in Ascidians

D

It is replaced by a vertebral column in adult frog

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The correct Answer is:
A
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