( ( ( ( ( Reptiles ( like crocodiles ) ) ( have ( ( ( two chambers ) and ) ( ( four circuits ) ( like ( the ( ( birds and ) mammals ) ) ) ) ) ) ) but ) ( ( ( other reptiles ) ( such ( as ( ( lizards and ) snakes ) ) ) ) ( have ( ( ( two circuit ) and ) ( ( ( three chambers ) ( -LRB- ( ( ( ( ( ( ( right atrium ) , ) ( left atrium ) ) , ) and ) ( the ventricle ) ) -RRB- ) ) ) ( in ( their ( circulatory system ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (NNS Reptiles)) (PP (IN like) (NP (NNS crocodiles)))) (VP (VBP have) (NP (NP (CD two) (NNS chambers)) (CC and) (NP (NP (CD four) (NNS circuits)) (PP (IN like) (NP (DT the) (NNS birds) (CC and) (NNS mammals))))))) (CC but) (S (NP (NP (JJ other) (NNS reptiles)) (PP (JJ such) (IN as) (NP (NNS lizards) (CC and) (NNS snakes)))) (VP (VBP have) (NP (NP (CD two) (NN circuit)) (CC and) (NP (NP (NP (CD three) (NNS chambers)) (PRN (-LRB- -LRB-) (NP (NP (JJ right) (NN atrium)) (, ,) (NP (JJ left) (NN atrium)) (, ,) (CC and) (NP (DT the) (NN ventricle))) (-RRB- -RRB-))) (PP (IN in) (NP (PRP$ their) (JJ circulatory) (NN system))))))) (. .)))
Reptiles like crocodiles have two     chambers and four circuits like the birds and mammals but other     reptiles such as lizards and snakes have two circuit and three     chambers (right atrium, left atrium, and the ventricle) in their     circulatory system.
(ROOT (S (PP (IN Like) (NP (NP (DT all) (NNS tetrapods)) (PP (IN except) (NP (NNS birds) (CC and) (NNS mammals))))) (, ,) (NP (NNS frogs)) (VP (VBP possess) (NP (NP (DT a) (NN heart)) (PP (IN with) (NP (CD three) (NNS chambers))))) (. .)))