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Principle #1 - Genetic Variation The genetic variation in the squirrel species is there are a light furred squirrel and a dark furred squirrel.
Principle #2 - Overproduction and the struggle to survive Squirrels will always produce more offspring then the environment can sustain.
Principle #3 - Differential survival and reproduction The Dark furred squirrels have more chance of survival and reproduction than the light furred squirrels.
Principle #4 - Gene Pool The dark allele is more prominent than the light allele because it has a higher chance of survival.
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