Which one of the following statements is totally P wrong about the ...

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Which one of the following statements is totally
P wrong about the occurrence of notochord, while the other three are correct?
W.
(a) It is present only in larval tail in ascidian.
(b) It is replaced by a vertebral column in adult frog.
(c) It is absent throughout life in humans from the very beginning.
(d) It is present throughout life in Amphioxus.
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