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principle #1 Genetic Variation: The Genetic Variation Is that there is black bats and bright grey bats that fly every night
Principle #2 Overproduction and the struggle for existence: Often mothers who have babies that are bright grey, they usually do not survive because owls are able to see them better in the night rather than the black ones because the camouflage with the dark sky.
Principle #3: Differential survival and reproduction: The population of the black bats is more likely to survive because they are less able to be seen and the grey bats because they are able to be seen more
Principle #4 Change in the gene pool: As the years pass by the change in the gene pool is that more of the bats become black because it is the more advantageous trait so that they can not be eaten by the owl
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