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

Question

All chordates are vertebrates, but all vertebrates are not chordates.

All vertebrates are chordates, and all chordates are vertebrates.

All vertebrates are chordates, but all chordates are not vertebrates.

Chordates are not vertebrates, and vertebrates are not chordates.

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