• At the end of the Permian, nearly 95% of all marine species died off.
  • 70% of land species became extinct.
  • Moving from the seas to land required many adaptations.
  • By the beginning of the Paleozoic, organisms evolved shells.
  • Fish evolved jaws and many other adaptations for ocean life.
  • Insects and spiders were already land dwellers by the time amphibians appeared.
  • In the Cambrian Explosion, there was an explosion of life.
  • This explosion was in number and in diversity.
  • It is possible that multiple things went wrong at the same time.
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