( ( ( The ( ( most important ) rhythm ) ) ( in chronobiology ) ) ( ( is ( ( ( the ( circadian rhythm ) ) , ) ( ( a ( roughly ( 24-hour cycle ) ) ) ( shown ( by ( ( physiological processes ) ( in ( all ( these organisms ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (ADJP (RBS most) (JJ important)) (NN rhythm)) (PP (IN in) (NP (NN chronobiology)))) (VP (VBZ is) (NP (NP (DT the) (NN circadian) (NN rhythm)) (, ,) (NP (NP (DT a) (RB roughly) (JJ 24-hour) (NN cycle)) (VP (VBN shown) (PP (IN by) (NP (NP (JJ physiological) (NNS processes)) (PP (IN in) (NP (PDT all) (DT these) (NNS organisms))))))))) (. .)))
The most important rhythm in chronobiology is the circadian rhythm, a roughly 24-hour cycle shown by physiological processes in all these organisms.
(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))))) (. .)))