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Principal #1- Genetic Variation some fish are blue and some others are orange.
Principal #2-Over production and fighting for Survival Will most likely produce more offspring then the environment.
Principal #3-Different survival and Reproduction The orange fish is easy to find because it doesn't camouflage to the water like the blue fish.
Principal #3- Different Survival and Reproduction The blue fish can camouflage long enough for it to reproduce
Principal #4-Changes in the Pool The blue fish has higher fitness than the orange fish, the blue fish will increase in the lake.
That's Natural Selection
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