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Principle #1- Genetic Variation Genetic Variation exists in the turtles because some are green and some are tan.
Principle #2- Overproduction Struggle for survival The turtles always have more offspring that there environment can't support. Not all of the turtles will survive.
Principal #3- Differential Survival and Reproduction For the bird the green turtles are easier for it to see than the tan ones because they use camouflage very well.
Principal #3- Change in Gene Pool How the tan turtles survive longer because of camouflage they are able to reproduce.
Principal #4- Change in Gene pool How the fitness of tan turtles grow over time the allele will increase in the gene pool.
That is Natural Selection!
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