An experimental subject is isolated in an underground room with no windows,no clocks,and no contact with the outside world.Researchers monitoring his behavior observe that he eats breakfast a little bit later each day.What term best describes the subject's biological activity?
A)Circadian rhythm
B)Free-running rhythm
C)Jet lag
D)Phase shift
E)Entrainment

Question

An experimental subject is isolated in an underground room with no windows,no clocks,and no contact with the outside world.Researchers monitoring his behavior observe that he eats breakfast a little bit later each day.What term best describes the subject's biological activity? 
A)Circadian rhythm
B)Free-running rhythm
C)Jet lag
D)Phase shift
E)Entrainment

Quizplus · Accepted Answer

The subject's biological activity is best described as a free-running rhythm, which occurs when natural environmental cues (like light) are absent, causing the body's internal clock to follow its own cycle rather than the 24-hour day.

An Experimental Subject Is Isolated in an Underground Room with No