In some chordates,the notochord is replaced by the vertebral column. Such animals are called vertebrates. Which one of the following statements is correct?

  • 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.

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