Amber is underweight. To keep warm in chilly environments, she wears more clothing than her overweight friend Kim. Why?
A. Compared to Kim, Amber has more phospholipids in her cell membranes.
B. Compared to Kim, Amber consumes more partially hydrogenated fatty acids.
C. Compared to Kim, Amber has a higher HDL cholesterol level.
D. Compared to Kim, Amber doesn't have as much insulating fat under her skin.
Answer: D
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