<P> A circadian rhythm ( / sɜːrˈkeɪdiən / ) is any biological process that displays an endogenous , entrainable oscillation of about 24 hours . These 24 - hour rhythms are driven by a circadian clock , and they have been widely observed in plants , animals , fungi , and cyanobacteria . </P>
<P> A circadian rhythm ( / sɜːrˈkeɪdiən / ) is any biological process that displays an endogenous , entrainable oscillation of about 24 hours . These 24 - hour rhythms are driven by a circadian clock , and they have been widely observed in plants , animals , fungi , and cyanobacteria . </P>
biological processes that systematically vary over a 24-hour cycle are called
biological processes that systematically vary over a 24-hour cycle are called
circadian rhythm
circadian rhythm