The Arctic ground squirrel can survive extremely cold winters by allowing its body temperature to fall close to the freezing point. Which survival mechanism does it use?

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A aestivation
B deep hibernation
C camouflage
D migration

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Answer: B. deep hibernation

The correct answer is B: Deep hibernation (or an extreme form of torpor/hibernation where its body temperature drops below freezing down to about -2.9°C or 27°F).

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The Arctic ground squirrel can survive extremely cold winters by allowing its body temperature to fall close to the freezing point. Which survival mechanism does it use?

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