Mutations can affect the structure and function of an organism. Give an example of a mutation that could cause a phenotype that makes an organism better suited for its environment.

A fox coat becoming white in a tundra environment.

Explanation:

A phenotype is the traits of an animal we can see with our eyes. This can be color, limbs, size, ect. For your question it's basically asking you to name a change in a animal that will allow it to work better in it's environment.