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Principle# 1 Genetic Variation: In this slide it shows the thick and thin furred polar bears.
Principle # 2 Overproduction and the struggle for Existence The thin furred polar bear struggles to survive due to the extreme cold and the thick furred polar bear won't have to struggle and reproduce on time
Principle # 3 Differential survival and reproduction The thin furred polar bear didn't reproduce in time therefor the thick furred one did.
Principle # 4 changes in gene pool The thin furred polar bear died due to extreme cold but the thick furred one repoduced
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