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Principle #1 Genetic Variation: There are two types of water snake blue snakes and tan snakes.
Principle #2 Overproduction & the Struggle for Existence: The blue snake gets eaten by eagles since the blue snake is more easy to spot then the tan snakes in the sand
Principle #3 Differential Survival & Reproduction: The tan snakes are more able to survive since they can get to the water with out getting spotted and eaten.
Principle #4 Change in Gene Pool: Over time the gene pool will be mostly tan snakes
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