Answer the following question given this paragraph: Circadian rhythms are regular changes in biology or behavior that occur in a 24-hour cycle. In humans, for example, blood pressure and body temperature change in a regular way throughout each 24-hour day. Q: What are regular changes in biology or behavior that occur in a 24 hour cycle? Choices: - cognitive rhythm - auditory rhythm - life cycle - circadian rhythm A:
A:
circadian rhythm