Some lizards have a colouration that allows them to blend in with their surrounds. These lizards are better able to escape predators, and thus live long enough to reproduce. This reflects the concept of

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The coloration of the lizards is a result of natural selection, where the trait (coloration) that allows for better survival (escaping predators) is passed on to the next generation through reproduction, leading to an increase in the frequency of that trait in the population.

Some Lizards Have a Colouration That Allows Them to Blend