Which of the following statements is correct regarding the history of life on Earth?

  • A
    $99\%$ of species that have ever existed are now extinct.
  • B
    $25\%$ of species that have ever existed are now extinct.
  • C
    $40\%$ of species that have ever existed are now extinct.
  • D
    $30\%$ of species that have ever existed are now extinct.

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