Final answer:
Circadian rhythms are biological cycles that can be influenced by external cues like light. Zeitgebers play a crucial role in regulating our internal clock.
Explanation:
Circadian rhythms are internal rhythms of biological activity that fluctuate over approximately 24 hours even under constant conditions. These rhythms can drift out of phase with the environment but become entrained to a 24-hour cycle when exposed to light and other environmental cues. Light, social activity, noise, temperature, and food are examples of zeitgebers that influence our biological clock and help synchronize it with the solar cycle.
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