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  • #1 Genetic Variation Variation exists between the beetles. Some are Brown and some are Green. 
  • #2 Overproduction and the struggle for existence Beetles produce more offspring then the environment can support. Not all of them will survive.
  • #3 Differential Survival and Reproduction Green beetles are easier to spot on the brown bark. Brown beetles camouflage and are less easier to eat.
  • #3 Differential Survival and reproduction Since the brown beetles camouflage they are able to survive and reproduce.
  • #4 Changes in Gene pool Because brown beetles have a better fitness the brown allele gene will increase over time.
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