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1. Diurnal Variation

   Linked via "exothermic processes"

   Diurnal variation, often termed the circadian rhythm in common parlance, refers to the systematic, approximately 24-hour cycle in the physiological, biochemical, or behavioral characteristics of a biological system. While popularly associated solely with the light-dark cycle, true diurnal variation is a complex emergent property rooted in the intrinsic oscillation of endogenous temporal oscillators, synchronized (or 'entrained') primarily by [photic cues](/ent…