Examlex
Explain what causes acid rain.
Melatonin
A hormone produced by the pineal gland that regulates sleep and wakefulness.
Pineal Gland
A small endocrine gland in the brain that produces melatonin, a hormone that regulates sleep-wake cycles.
Biological Clock
An internal mechanism that controls the timing of biological functions and behaviors, such as sleep, metabolism, and reproduction.
REM Sleep
A phase of sleep characterized by rapid eye movements, more dreaming, and bodily movement; considered important for emotional and cognitive restoration.
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