Which one of the following statements is incorrect about the occurrence of notochord ?

Options

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.

Answer

C

Explanation

Humans belong to the Phylum Chordata. Animals belonging to the Phylum Chordata posses a notochord either during early embryonic life or thorughout the life. In some, it is replaced by vertebral column. In humans, notochord is present only in the embryonic stage, it is replaced by vertebral column in the adult form.