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?
(a) the decrease in the amount of daylight in winter causes a change in gene expression, which results in the foxes growing a lighter- appearing coat.
(b) the diet of the foxes in summer lacks a particular nutrient, which causes the foxes to lose their white coat and grow a darker- colored coat.
(c) competition for mates in the spring causes each fox to increase its camouflage with the environment by producing a darker- appearing coat.
(d) the lower temperatures in winter denature the pigment molecules in the arctic fox coat, causing the coat to become lighter in color.