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  • Genetic Variation 
  • Overproduction & the Struggle for Existence
  • Differential Survival and Reproduction 
  • - Brown Butterflies - Yellow Butterflies
  • Change in Gene Pool
  • Yellow butterflies are struggling to survive because they are being eaten by owls. 
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  • Brown butterflies have a higher survival rate and are more likely to reproduce more offspring because they are able to camouflage with the brown bark of the trees.
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  • The brown butterflies will pass down the trait of having brown wings to their offspring. This means that the population of brown butterflies will rise and the population of yellow butterflies will decrease. 
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