In the absence of clocks,miners trapped underground for several weeks probably will adopt a rest-activity cycle that is _____ hours in length.
A)less than 23
B)about 24
C)about 25
D)more than 26

Question

Quizplus · Accepted Answer

In the absence of external time cues such as daylight and clocks, humans tend to have an internal body clock with a slightly longer than 24-hour cycle, known as the circadian rhythm. Studies have shown that when people are isolated from external time cues for extended periods of time, their body clocks tend to drift towards a longer cycle length of around 25 hours. Therefore, it is likely that miners trapped underground for several weeks would adopt a rest-activity cycle that is about 25 hours in length.

In the Absence of Clocks,miners Trapped Underground for Several Weeks