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Principle #1 Genetic variation: Between the rat population is the ones with tan fur and grey fur. The variation is in favor of the tan fur rat.
Principle #2 overproduction and struggle for survival: many grey fur rats made; however, not many made it. The rats with grey fur struggle to survive because they can lend in with the grass like the tan fur rats.
Principle #3 differential survival and Reproduction:the rats with the tan color fur have higher fitness which means that they will survive and reproduce.
Principle #4 change in pool: the better trait is the tan color fur so the gene pool changed and it took over which means their is no more grey color fur rats the tan fur rats have reproduce more than the grey.
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