Biological clock (Bora Zivkovic, A Blog Around the Clock)

"A biological clock is a structure that times regular re-occurence of biochemical, physiological and behavioral events in an organism in constant environmental conditions Perhaps the best way to explain this is to dissect the definition word-by-word, explaining my choice of words included (and those omitted) in the definition. But first, I need to make it clear that I am NOT trying to invent a new definition, or to impose my views on others. Instead, I am trying to capture the sense in which the term has actually been used by the practitioners in the field, and the way such usage may have changed over time."

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