Arctic foxes typically have a white coat in the winter. In summer, when there is no snow on the ground, the foxes typically have a darker coat. Which of the following is most likely responsible for the seasonal change in coat color?

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Environmental factors can affect the phenotype of an organism through interaction with the gene.

The diet of the foxes is unlikely to be significantly different during the winter.

Foxes would not want to camouflage if they intended to attract a mate.

Extreme temperatures could denature proteins, but are unlikely to denature pigments.