( ( The ( ( ( circulatory and ) digestive ) systems ) ) ( ( are separate ) . ) )
(ROOT (S (NP (DT The) (ADJP (JJ circulatory) (CC and) (JJ digestive)) (NNS systems)) (VP (VBP are) (ADJP (JJ separate))) (. .)))
The circulatory and digestive systems are separate.
(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)))))))))))))) (. .)))