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Principle #1: Genetic Variation There are 2 types of beetles in this tree, Green ones and brown ones.
Principle #2: Overproduction Struggle for survival The beetles could produce more offspring than the environment can support. Not all of them will survive
Principle #3: Differential Survival Crows will eat the tan beetles because they are easier to spot
Principle #3: Reproduction The brown beetles survive and can produce offspring
Principle #4: Change in Gene Pool. More Brown beetles are made than tan ones.
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