Which of the Following Does Not Characterize a Free-Running Circadian

question 15

Multiple Choice

Which of the following does not characterize a free-running circadian rhythm?

• A) If the period is less than 24 hours, the animal begins its activity a little later each day.
• B) Its period is under genetic control.
• C) It occurs under constant environmental conditions.
• D) Its clock runs according to its natural period.
• E) Mutations can create differences in period lengths within a species.

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