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principle #1 Genetic Variation: within the population there is bears with thick coats and thin coats.
principle #2 Overproduction & the Struggle for Existence: the overproduction in the populations are bears with thin coats, and the thin coats will have a struggle to live due to the cold.
principle #3 Differential Survival &Reproduction: the ones that will survive are the thick coats they have the higher fitness to stand the cold and they are likely to mate with others females.
principle #4 Change in Gene pool: the changes in the gene that in the future the thick coats will be more common.
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