Which one of the following statements is tota | vedclass

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(C) The correct answer is $C$. $A$: In Ascidians (Urochordata),the notochord is present only in the larval tail. This statement is correct. $B$: In ad

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It is absent throughout life in humans from the very beginning.

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(C) The correct answer is $C$. $A$: In Ascidians (Urochordata),the notochord is present only in the larval tail. This statement is correct. $B$: In adult frogs (Vertebrata),the notochord is replaced by a vertebral column. This statement is correct. $C$: Humans are chordates. In all chordates,the notochord is present at least during the early embryonic stage. Therefore,saying it is absent from the very beginning in humans is incorrect. $D$: In Amphioxus (Cephalochordata),the notochord extends from the head to the tail region and persists throughout their life. This statement is correct.

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

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