Mice evolution example

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  • At first, the mice's environment looked this and the brown fur trait was better adapted their environment.  The brown mice had fitness.
  • Over time their environment changed to look like this.
  • The mice still had to watch out for the hawk, but the could now see the brown mice better.
  • Natural selection worked through an existing variation in the mice population. The green fur trait is better suited to the new environment
  • The green now have fitness.
  • Through the long process of natural selection, the brown have become extinct!
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