A) It is present only in larval tail in ascidians.
B) It is replaced by a vertebral column in adult frog.
C) It is absent throughout the life in humans from the very beginning.
D) It is present throughout life in Amphioxus.
Correct Answer: C
Solution :
[c] Notochord is a flexible rod like structure that forms the main support of the body in the lowest chordates. It is not absent in humans throughout their life. Notochord is present in embryonic stage and get changed or replaced by vertebral column in the adult.
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