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If national saving in a closed economy is greater than zero, which of the following must be true?
Light Perception
The ability to see light and differentiate between its intensity and direction, a fundamental aspect of vision.
Circadian Rhythms
Biological processes that occur on a roughly 24-hour cycle, influencing sleep, wakefulness, and various bodily functions.
Pineal Gland
A small endocrine gland in the brain that produces melatonin, a hormone that regulates sleep patterns.
Melatonin
A hormone produced by the pineal gland that regulates sleep-wake cycles.
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