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Which of the Following Is a Stock

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Which of the following is a stock?


Definitions:

Stage 1 Sleep

Stage 1 sleep is the initial phase in the sleep cycle, characterized by light sleep from which one can be easily awakened.

Pineal Gland

A small endocrine gland in the brain that produces melatonin, a hormone that regulates sleep-wake cycles.

Melatonin

A hormone that regulates sleep-wake cycles, produced by the pineal gland in the brain.

Suprachiasmatic Nucleus

A part of the brain located in the hypothalamus, responsible for controlling circadian rhythms.

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