Which of the following situations best represents a homeostatic mechanism?
A. After going outside on a hot day, the core body temperature increases.
B. A person who becomes very nervous begins to sweat profusely.
C. As age increases, the amount of calcium in bones tends to decrease.
D. After eating a large batch of salty popcorn, levels of salt in the urine increase.
E. Increasing the size of fast-food restaurant portions causes body weight to increase.
Answer: D
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