Which of the following best explains how natural selection is involved in the evolution of the Arctic fox’s thick fur coat?

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Arctic foxes have a thick layer of fat and dense, white fur to help protect them from the freezing temperatures of the Arctic habitat where they live. Natural selection is thought to be involved in the evolution of the Arctic fox’s thick coat of fur. 


Which of the following best explains how natural selection is involved in the evolution of the Arctic fox’s thick fur coat?