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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 present throughout life in Amphioxus

B

It is present only in larval tail in Ascidians

C

It is replaced by vertebral column in adult frog

D

It is absent throughout life in humans from the very beginning

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The correct Answer is:
D
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