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Principle #1 - Genetic Variation In this species of fish, blue and tan colored fish exist.
Principle #2 - Overproduction and the Struggle for Existence This species of fish will eventually produce more fish than the environment can handle.
Principle #3 - Differential Survival and Reproduction The blue fish are obviously more noticeable than the tan fish (whom camouflage really well).
Principle #3 - Differential Survival and Reproduction The tan fish live longer to reproduce more fish.
Principle #4 - Changes in the Gene Pool There are changes in the amount of blue and tan fish; there are more tan than blue.
The shark continues eating the few blue fish that are left.
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