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principle #1 .. genetic variation There are two types of squirrels , one has a light fur coat and one has a darker fur coat , the lighter one is faster than the darker ones
Principle number2 , struggle and overproduction as foxes approach nearby they hunt for food in this case squirrels , since the lighter ones are faster they can get away but sadly the darker ones are eaten :(
Since the light brown squirrels were faster their fitness is better than the brown ones due to the fact that they they can run away , they can actually reproduce and spread that gene
Due to the fact that light squirrels are dominant to the brown squirrels they produce more offspring with that trait as they increase and as the brown ones decrease because they get eaten by predators
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