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


B

Anatomy & Physiology

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This figure shows the femur. The feature indicated by number 1 is the

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The crown of a tooth is covered by

A) enamel. B) cement. C) dentin. D) pulp. E) periodontium.

Anatomy & Physiology

Building up large molecules is called _______

Fill in the blank(s) with correct word

Anatomy & Physiology

A hormone whose production is associated with seasonal fluctuations in day length is ________.

Fill in the blank(s) with the appropriate word(s).

Anatomy & Physiology