(Question)
Q: What are regular changes in biology or behavior that occur in a 24 hour cycle? Choices: - cognitive rhythm - auditory rhythm - life cycle - circadian rhythm A:
(Answer)
circadian rhythm

(Question)
Q: What is the scale on which acidity is measured? Choices: - m - hp - g - ph A:
(Answer)
ph

(Question)
Q: What is the disease in which bones lose mass and become more fragile and likely to break? Choices: - arthritis - tuberculosis - fibrosis - osteoporosis A:
(Answer)
osteoporosis