By karelyg, Updated
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Principle #1- Genetic Variation is in the snake species. some are dark brown others are light brown.
Principle #2- Overproduction and the struggle to survive. snakes will always produce more offspring than the enviroment can support. Not all of them will survive.
Principle #3- Differential Survival and Reproduction. The dark brown snakes are easier for the hwak to spot. the light brown snakes camo. better into their background.
Principle #4- Changes in the gene pool. The lighter brown snakes have higher fitness, over time their will only be light brown snakes.
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