There is a range of color in mice from black to brown to gray to white. In a region of white sand there is a black volcanic deposit. The white mice survive better on the white sand and the black mice survive better on the black volcanic deposit. This could be an example of

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This scenario is an example of disruptive selection because two extreme phenotypes (black and white mice) have a survival advantage in their respective environments (black volcanic deposit and white sand), while intermediate phenotypes would be at a disadvantage in both environments.

There Is a Range of Color in Mice from Black