( ( The heart ) ( ( appears ( to ( have ( ( ( ( ( four chambers ) , ) ( like ( ( ( mammals and ) birds ) ( -LRB- ( ( reptiles ( have three ) ) -RRB- ) ) ) ) ) , ) ( which ( ( adds ( another brick ) ) ( to ( ( ( the wall ) ( of evidence ) ) ( that ( ( supports endothermy ) ( in dinosaurs ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN heart)) (VP (VBZ appears) (S (VP (TO to) (VP (VB have) (NP (NP (CD four) (NNS chambers)) (, ,) (PP (IN like) (NP (NP (NNS mammals) (CC and) (NNS birds)) (PRN (-LRB- -LRB-) (S (NP (NNS reptiles)) (VP (VBP have) (NP (CD three)))) (-RRB- -RRB-)))) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ adds) (NP (DT another) (NN brick)) (PP (TO to) (NP (NP (DT the) (NN wall)) (PP (IN of) (NP (NN evidence))) (SBAR (WHNP (WDT that)) (S (VP (VBZ supports) (ADVP (RB endothermy)) (PP (IN in) (NP (NNS dinosaurs)))))))))))))))) (. .)))
The heart appears to have four chambers, like mammals and birds (reptiles have three), which adds another brick to the wall of evidence that supports endothermy in dinosaurs.
(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))))) (. .)))