question_answer

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

A)  All chordates are vertebrates but all vertebrates are not chordates.

B)  All vertebrates are chordates and 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.