Fact 1: Hibernation is used for conserving energy by some animals. Fact 2: Animals that sleep through the winter are said to hibernate. Given the two facts above, answer the question "Why do animals sleep through winter?" with the following options: - To conserve energy - recovery time from fatigue - They get bored - Endocrine system - They only like warmth - dormant state - To save time - hydration
To conserve energy