In some chordates, the notochord is modified as the vertebral column. Such animals are called vertebrates. Which one of the following statements makes sense?

Options

A. It is present only in larval tail in ascidian
B. All vertebrates are chordates but all chordates are all chordates are vertebrates.
C. All vertebrates are chordates but all chordates are not vertebrates.
D. Chordates are not vertebrates and vertebrates are not chordates.

Answer

C