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Homeostasis typically relies on negative feedback because positive feedback


A) requires a response but not a stimulus.
B) drives processes to completion rather than to a balance point.
C) acts within, but not beyond, a normal range.
D) can decrease but not increase a variable.
E) involves one location rather than several across the body.

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Which of the following would increase the rate of heat exchange between an animal and its environment?


A) feathers or fur
B) vasoconstriction
C) wind blowing across the body surface
D) countercurrent heat exchanger
E) blubber or fat layer

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