Which mechanism allows arctic ground squirrels to survive in frozen burrows during hibernation despite sub-zero temperatures?

💡 Explanation

When arctic ground squirrels hibernate, regulated ice nucleation occurs because specialized proteins control ice crystal formation extracellularly, preventing intracellular damage from ice formation, allowing survival at sub-zero temperatures. Therefore extracellular ice nucleation adaptation results, rather than shivering, apoptosis, or countercurrent exchange which serve alternate thermoregulatory functions.

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