( ( ( ( ( All animals ) , ) ( including humans ) ) , ) ( ( have ( evolved ( ( ( circadian rhythms ) , ) ( which ( respond ( to ( ( the ( earth 's ) ) ( 24-hour cycle ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT All) (NNS animals)) (, ,) (PP (VBG including) (NP (NNS humans))) (, ,)) (VP (VBP have) (VP (VBN evolved) (NP (NP (NN circadian) (NNS rhythms)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP respond) (PP (TO to) (NP (NP (DT the) (NN earth) (POS 's)) (JJ 24-hour) (NN cycle))))))))) (. .)))
All animals, including humans, have evolved circadian rhythms, which respond to the earth's 24-hour 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))))) (. .)))