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Principle #1: Genetic Variation 2 types of bears one that have thick fur and the other one that has thin fur.
Principle #2: Overproduction & The Struggle for Existence For overproduction there are more of the thick coat bears because they are reproducing.
Principal #3: Differential Survival and Reproduction The thick coat bears have a better chance of survival due to the fact of them being able to keep warm, and the thin bear freezing to death.
Principal #4: Change in Gene Pool The bears with the thick fur are able to reproduce more and make it through hibernation. While the thin fur die of the coldness.
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