( ( Most species ) ( ( have ( a ( three-chambered heart ) ) ) . ) )
(ROOT (S (NP (JJS Most) (NNS species)) (VP (VBP have) (NP (DT a) (JJ three-chambered) (NN heart))) (. .)))
Most species have a three-chambered heart.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD three) (NNS chambers)) (PP (IN in) (NP (DT an) (NN amphibian) (NN heart))))) (. .)))