Final answer:
Hibernation and estivation are both examples of torpor, a state of lowered metabolic rate. Animals hibernate to survive cold conditions while estivation enables survival in hot, dry climates.
Step-by-step explanation:
Hibernation and estivation are both examples of torpor. Torpor is a state in which an animal's metabolic rate significantly lowers, allowing it to wait until its environment better supports its survival. Hibernation helps animals survive cold conditions, while estivation allows animals to survive in hot, dry climates. Some animals, like the wood frog, have adaptations such as antifreeze-like chemicals in their cells to prevent freezing.