People and Most Other Animals Wake Up and Go to Sleep

question 104

Multiple Choice

People and most other animals wake up and go to sleep on a regular basis, at about the same time every 24 hours. What causes this 24-hour cycle?

• A) It depends entirely on patterns of light and darkness.
• B) It depends mainly on the influence of other animals.
• C) It is generated by a built-in mechanism within each individual.
• D) It depends mainly on fluctuations in the temperature of the environment.

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