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Principle #1- genetic variation Variation exists in the mouse species some mice are white, the others are brown
Principle #2- over production and the struggle for existence Mice will always produce more offspring than the environment can support. not all will survive.
Principle #3- Different survival and reproduction The white mice are easier for the leopard to spot in the brown land. the brown mice camouflage well.
Principle #3- different survival and reproduction
Principle #4- change in gene pool
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