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What is the BEST example of a positive feedback loop? A. Adnan sweats until he stops playing football. B. Samir shivers until his body warms up. C. Mariana experiences contractions until her baby is born. D. Stephanie grows until her body stops secreting growth hormones.

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C. Mariana experiences contractions until her baby is born.

Explanation: Labor is a classic positive feedback loop — cervical stretching prompts oxytocin release, which increases uterine contractions and more cervical stretching until delivery. The others are examples of negative feedback (sweating and shivering restore body temperature; growth is regulated by negative feedback).