Principle #1 - genetic variation Variation exits in most animals, even rats. In this example some are black and some are grey.
Principle #2 - Overproduction and the Struggle for Existence When rats have off springs, not all survive.
Principle #3 - Differential Survival and Reproduction The black rat have the ability to camaflogue against the dark, on the other hand the rats an easily be seen by the owl.
Principle #3 - Differential survival and Reproduction Since the dark rats camaflogue, they survive longer
Principle #4 - Changes in Gene Pool The darker rats have a better change of living and producing an offspring, they have a bigger gene pool.
And thats natural selection
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