Mammals have two biological clocks: one involving __________ and the other involving __________.
A) eating; sexual arousal
B) brain arousal; hormonal levels
C) daily cycles; 90 minutes cycles
D) dreaming; waking
E) reproduction; growth

Question

Quizplus · Accepted Answer

Mammals have two biological clocks: one governing daily cycles (circadian rhythms) and the other involving 90-minute cycles (ultradian rhythms), which regulate shorter periods of activity such as sleep cycles.

Mammals Have Two Biological Clocks: One Involving __________ and the Other