Examlex
Osmotic and matric potentials are commonly negative because the soil water has a lower energy level than that of pure water.
Echinacea
A genus of herbaceous plants, some species of which are used in herbal medicine, primarily for immune system support.
Melatonin
A substance secreted by the pineal gland that controls the circadian rhythms.
Melatonin
A hormone produced by the pineal gland that regulates sleep-wake cycles.
Sleep
A natural, reversible state of reduced responsiveness to external stimuli, essential for human health and well-being.
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