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Principle #1 Variation consist in different colors in fish some maybe a bright color that stand out and others may have the color of a tan.
Principle #2 Overproduction Fishes will always produce more offspring then the environment can handle, not all the offspring will survive.
Principle #3 Differential Survival and Reproduction The blue fish are the ones that will always be easy to spot in a sandy environment. The fish that camouflage with the sandy environment will have a better chance of survival.
Principle #3 Differential Survival and Reproduction Since the sandy fish blend very well with the sandy environment they have a better chance of surviving and producing more offspring.
Principle #4 Changes in Gene Pool - Since the fish with the sandy colored fish have a better fitness than the other fish, the gene that has to do with color will be increased in the gene pool and now more fish will be able to camouflage.
That's the 4 Principles of Natural Selection
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