In which of the following animals would you expect circannual rhythms to be most pronounced?
A) Humans
B) Hummingbirds that live in relatively constant environments
C) Bears, which hibernate in the winter
D) Fruit flies, whose life span is usually shorter than a month
E) None of the above

Question

Quizplus · Accepted Answer

Circannual rhythms refer to biological rhythms that occur once a year. Among the given choices, bears are known for their hibernation during winter, which is an annual cycle. Therefore, we would expect circannual rhythms to be most pronounced in bears.

In Which of the Following Animals Would You Expect Circannual