Kiltie (1989) Examined Approximately 2000 Museum Specimens of Fox Squirrels

Kiltie (1989) examined approximately 2000 museum specimens of fox squirrels, described as the most variable in color of all mammals in North America, and determined the percentage of dorsal black for each of the skins. He found that the incidence of melanistic individuals is correlated with the ______ over the total range of the squirrel.

A) annual rainfall
B) average temperature
C) frequency of hailstorms
D) frequency of wildfires

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