Editing Biological clock (section)

{{wiktionary|biological clock}}
'''Biological clock''' may refer to:
* [[Age and female fertility]], decrease of female fertility with advancing maternal age 
* [[Ageing]], biological program that limits the lifespan of an individual
* [[Biological rhythm]]s
* Internal clock, the timeframe sensed by the individual's body which is largely affected by the light-dark cycle
* [[Circadian clock]], a molecular mechanism that results in a circadian rhythm in a living organism
* [[Circadian rhythm]], biological process that displays an oscillation about 24 hours, such as the human sleep-wake cycle (the "body clock")
* [[Epigenetic clock]], a set of DNA sites whose methylation levels can be used to measure aging throughout the body
* [[Molecular clock]], a technique that uses the mutation rate of a biomolecule to deduce the time in prehistory when two life forms diverged
* [[Vernalisation]], the induction of flowering by prolonged exposure to low temperatures, as during the winter in a temperate climate
* [[Menstrual cycle]], the regular natural change that occurs in the female reproductive system that makes pregnancy possible

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