Suppose You Work on a Submarine with Only Artificial Light

 Suppose you work on a submarine with only artificial light. You are required to follow a schedule of working for 12 hours and then sleeping for 6. What rhythm, if any, will your alertness and body temperature show?

A) They will follow a rhythm of 18 hours.
B) They will follow the usual rhythm of 24 hours.
C) They will follow a rhythm of 21 hours.
D) They will cease to show any consistent rhythm.

Correct Answer:

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