( ( ( ( Heart ( is four-chambered ) ) and ) ( they ( are ( homeothermic animals ) ) ) ) . )
(ROOT (S (S (NP (NNP Heart)) (VP (VBZ is) (ADJP (JJ four-chambered)))) (CC and) (S (NP (PRP they)) (VP (VBP are) (NP (JJ homeothermic) (NNS animals)))) (. .)))
Heart is four-chambered and they are homeothermic animals.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS chambers)) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))