When scientists use the term "biological rhythm," they are referring to:
A) a periodic, more or less regular, fluctuation in the physiological functioning of a living organism.
B) an awareness of oneself and the environment.
C) a biological fluctuation that occurs less frequently than once a day.
D) a biological fluctuation that lasts about 24 hours from peak to peak.

Question

Quizplus · Accepted Answer

A biological rhythm refers to a periodic, more or less regular fluctuation in the physiological functioning of a living organism, such as the sleep-wake cycle, circadian rhythms, menstrual cycles, and seasonal changes.

When Scientists Use the Term "Biological Rhythm," They Are Referring