If a rat population that lives in a cold northern tundra climate was moved to the desert, where temperatures are much warmer, and then allowed to evolve for many generations, which of the following hypothetical adaptations would be most likely to aid the rats with getting and staying cool?
a. A darker skin color that absorbs more sunlight
b. A reduction in the number of sweat glands
c. A larger body size
d. A smaller body size
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