• Species go extinct when all of the individuals die out or evolve into a different species.
  • Mass extinctions are caused by collisions with comets or asteroids, massive volcanic eruptions, or rapidly changing climate.
  • After a mass extinction, many habitats are no longer inhabited by organisms because they have gone extinct.
  • With new habitats available, some species will adapt to the new environments.
  • Many new species evolve to fill those available habitats.
  • At the end of this period of rapid evolution, life forms do not look much like the ones that were around before the mass extinction.
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