( ( ( The hearts ) ( of amphibians ) ) ( ( have ( ( ( ( ( three chambers ) , ) ( two atria ) ) and ) ( one ventricle ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS hearts)) (PP (IN of) (NP (NNS amphibians)))) (VP (VBP have) (NP (NP (CD three) (NNS chambers)) (, ,) (NP (CD two) (NN atria)) (CC and) (NP (CD one) (NN ventricle)))) (. .)))
The hearts of amphibians have three chambers, two atria and one ventricle.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD three) (NNS chambers)) (PP (IN in) (NP (DT an) (NN amphibian) (NN heart))))) (. .)))