READ: Animals and Energy
Completion requirements
Vocabulary
Vocabulary
- biological clock: Structure that controls the activities of an organism whose activities change on a regular 24-hour cycle.
- circadian rhythms: Regular change in biology or behavior that occurs in a 24-hour cycle.
- diurnal: Animals that are active during the daytime and rest during the night.
- hibernation: State in which an animal’s body processes are slower than usual, and its body temperature falls in order to conserve energy when food is scarce.
- migration: Regular movement of animals each year, usually to find food, mates, or other resources.
- nocturnal: Animals that are active during the night and sleep all day.