Michael is 26 years old. He becomes dehydrated after a long run if he has not drunk enough. His infant son Sean, however, becomes dehydrated fairly frequently. This difference in susceptibility to dehydration is because
A. the infant thirst mechanism is underdeveloped.
B. adults drink more liquid.
C. infants grow rapidly.
D. infant kidneys are less able to conserve water.
Answer: D
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