The circadian cycle: daily rhythms from behaviour to genes : Article : EMBO reports: "What is it good for?
Circadian clocks allow organisms to anticipate and 'prepare for' environmental changes, thereby increasing their fitness. For example, a photosynthetic machinery that is already geared up when the first sunrays appear will harvest more energy. A consequence of this logic is that the clock's benefits are most obvious under entrained conditions. "
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