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Principle #1 Genetic Variation: The genetic variation between the two types of bears are some with thick fur coats and some with thin fur coats
Principle #2 Overproduction and the Struggle for Exsistance: About two cubs are born during this time, but only one cub survives because of the weather. The bears with the thin fur coats struggle for survival
Principle #3 Differential Survival and Reproduction: Since the bears with the thick fur coats have a higher fitness they are able to survive and reproduce
Principle #4 Changes in the Gene Pool: The bears with thick fur coats are more common in the population over time
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