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. Entrainment
B. Circadian rhythm
C. Free-running rhythm
D. Phase shift
E. Jet lag


Answer: C

Anatomy & Physiology

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