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6. What did Siffre do?
- Spent a year on a mountain
- Spent 6 months in a cave
- Spent 6 months on a mountain
- Spent a year in a cave
7. How often does a circadian rhythm repeat?
- Every fortnight
- Every 24 hours
- Every 24 days
- Every 28 days
8. Who did research into the syncing of women's menstrual cycles?
- McDonald
- McClinton
- McClintock
- Clinton
9. Give an example of an ultradian rhythm
- The stages of sleep
- Meal times
- The sleep/wake cycle
- The menstrual cycle
10. What is influenced by light and social cues?
- Exogenous zeitgebers
- Endogenous pacemakers