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.

---

Definitions:

Minimum

The smallest or least amount allowable or possible in a given set of circumstances.

Maximum

The largest value in a given set of numbers or data points.

Range

The difference between the highest and lowest values in a dataset, offering a simple measure of data spread.

Variance

A measure of the dispersion of a set of data points around their mean, indicating how widely the data values are spread out.