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Workers on certain submarines work 6 hours, relax 6 hours, and then sleep 6 hours. After weeks on this schedule, what happens to their circadian rhythm?
A. It adjusts to produce an 18-hour rhythm.
B. It continues producing the usual 24-hour rhythm.
C. It produces a rhythm intermediate between 18 and 24 hours.
D. It stops producing any rhythm at all.


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