( Circadian ( ( Rhythm ( ( ( The ( cyclical changes ) ) ( in ( physiological ( ( processes and ) functions ) ) ) ) ( that ( are ( related ( to ( the ( 24-hour ( diurnal cycle ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Circadian)) (VP (VBZ Rhythm) (NP (NP (DT The) (JJ cyclical) (NNS changes)) (PP (IN in) (NP (JJ physiological) (NNS processes) (CC and) (NNS functions))) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBN related) (PP (TO to) (NP (DT the) (JJ 24-hour) (JJ diurnal) (NN cycle))))))))) (. .)))
Circadian Rhythm The cyclical changes in physiological processes and functions that are related to the 24-hour diurnal cycle.
(ROOT (S (NP (NP (JJ Regular) (NNS changes)) (PP (IN in) (NP (NN biology) (CC or) (NN behavior))) (SBAR (WHNP (WDT that)) (S (VP (VBP occur) (PP (IN in) (NP (DT a) (CD 24) (NN hour) (NN cycle))))))) (VP (VBP are) (NP (NP (NN part)) (PP (IN of) (NP (DT the) (NN circadian) (NN rhythm))))) (. .)))