Which of the following provides evidence that our 24-hour sleep-waking cycle is the result of a built-in mechanism?

Question

Quizplus · Accepted Answer

The fact that people who live in a near-polar region still generate close to a 24-hour cycle of sleeping and being awake suggests that our sleep-wake cycle is the result of a built-in mechanism, rather than external factors like daylight and darkness. This is evidence of an internal biological clock that regulates our sleep-wake cycle. The other options do not provide evidence of a built-in mechanism.

Which of the Following Provides Evidence That Our 24-Hour Sleep-Waking