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Natural Selection is the survival of the fittest. The creatures better suited to there environment will have a better chance of survival and to reproduce than ones that don't
In this example the green snake will have a better chance of survival than the red and black snake because the green snake is camouflaged with its environment
This is how species evolve. After many generations there will be a very small number of red snakes remaining as a comapred to a very large number of green snakes.
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