Examlex
Which of the following statements is true about the United States' intervention during the Cold War?
Melatonin
A hormone produced by the pineal gland that regulates sleep and wakefulness, often referred to as the "sleep hormone."
Circadian Rhythm
The physical, mental, and behavioral changes that follow a 24-hour cycle, primarily responding to light and darkness in an organism's environment.
Natural Substance
refers to any product or material found in nature, not artificially produced, often used in context with foods, medicines, and other products.
Hypnagogic Imagery
Vivid visual phenomena that occur during the onset of sleep.
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