Circadian rhythms are
A) endogenous cycles of activity over the course of a day.
B) not found in plants.
C) learned patterns of daily activity.
D) annual changes in behavior (such as migration).
E) monthly cycles of reproductive activity.

Question

Quizplus · Accepted Answer

Circadian rhythms are endogenous cycles of activity that occur over the course of about 24 hours. These rhythms are found in many organisms, including animals, plants, and fungi, and are governed by internal biological clocks that help regulate behavior and physiology.

Circadian Rhythms Are