Question

Protochordata marks the evolution of an important feature in the Animal Kingdom. Which of the following options best explains this?

• A. By presence of notochord
• B. By separating nervous tissue from the gut
• C. By developing a circulatory system
• D. None of the above.

Answer 1

The correct option is A

By presence of notochord

Protochordates (primitive chordates) are the first group of animals to show the presence of notochord at some stage of life. While the notochord does separate the nervous tissue from the gut, the presence of notochord is far more significant in evolutionary studies.