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What was the dispute in the 1830s Nullification Crisis?
Circadian Rhythms
The natural, internal processes that regulate the sleep-wake cycle and repeat roughly every 24 hours.
Pineal Gland
The pineal gland is a small endocrine gland in the brain that produces melatonin, a hormone that regulates sleep-wake cycles.
Melatonin
Melatonin is a hormone produced by the pineal gland that regulates sleep-wake cycles and is often used as a supplement to treat sleep disorders.
Hypothalamus
A small region of the brain that plays a crucial role in many important functions, including releasing hormones, regulating body temperature, and controlling hunger and thirst.
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