• Macroevolution is evolution over geologic time above the level of the species.
  • The process by which a new species evolves is called speciation.
  • Some members of a species must become reproductively isolated from the rest.
  • This means they can no longer interbreed with other members of the Species.
  • Usually they become geographically isolated first.
  • If they remain separated long enough, they may evolve genetic differences.
  • If the differences prevent them from interbreeding with the original species, they have evolved.
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