If an animal with a circadian clock of about 23.5 hours is kept in the dark without environmental time cues,it will
A) become active 30 minutes earlier each day.
B) become active at the same time each day.
C) become active 30 minutes later each day.
D) become active one hour earlier each day.
E) have an unpredictable pattern of activity.

Question

Quizplus · Accepted Answer

In the absence of environmental cues, an animal with a circadian clock shorter than 24 hours will become active slightly earlier each day, in this case, 30 minutes earlier, due to its 23.5-hour cycle.

If an Animal with a Circadian Clock of About 23