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Principle #1 Genetic variation: The genetic variation within the rat population is there are 3 white rats and 3 brown rats.
Principle #2 Overproduction & the struggle for existence: The white rats struggle for existence because they do not blend in with their environment and the lion is eating them, and the brown rats live to over produce their color.
principle #3 Differential survival and reproduction: within the rat population the brown rats survive longer and reproduce.
Principle #4 changes in gene pool: within the rat population the brown rats live longer to reproduce and create mot of there color
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