( They ( ( ( study ( ( ( the ( circulatory system ) ) and ) ( its relationship ) ) ) ( to ( a ( healthy body ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP study) (NP (NP (DT the) (JJ circulatory) (NN system)) (CC and) (NP (PRP$ its) (NN relationship))) (PP (TO to) (NP (DT a) (JJ healthy) (NN body)))) (. .)))
They study the circulatory system and its relationship to a healthy body.
(ROOT (S (NP (NP (DT A) (NN relationship)) (PP (IN between) (NP (CD two) (JJ human) (NN body) (NNS systems)))) (VP (MD could) (VP (VB be) (NP (NP (DT the) (JJ digestive) (NN system)) (SBAR (S (VP (VBZ absorbs) (NP (NP (NNS nutrients)) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (VP (VBN transported) (PP (IN by) (NP (DT the) (JJ circulatory) (NN system)))))))))))))) (. .)))