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Principle #1: There is two colors of squirrels light and dark, in a big park.
Principle #2: Over production is common everywhere, not every organism is going to live.
principle #3: The darker furred squirrels can blend into the trees ,more than the lighter furred ones, so natural selection goes with them.
principle #4: So overtime the light furred were able to produce but not as much as the dark furred because they were seen easily by its predator.
principle #5: After a while the gene pool eventually will change and there will be fewer light furred squirrels.
That is Natural Selection.
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