( ( Mammals ( -LRB- ( Mammalia -RRB- ) ) ) ( ( are ( ( a group ) ( of ( tetrapods ( that ( have ( ( ( ( ( ( ( hair , ) ( a ( four-chambered heart ) ) ) , ) ( a diaphragm ) ) , ) and ) ( mammary glands ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Mammals)) (PRN (-LRB- -LRB-) (NP (NNP Mammalia)) (-RRB- -RRB-))) (VP (VBP are) (NP (NP (DT a) (NN group)) (PP (IN of) (NP (NP (NNS tetrapods)) (SBAR (WHNP (WDT that)) (S (VP (VBP have) (NP (NP (NN hair)) (, ,) (NP (DT a) (JJ four-chambered) (NN heart)) (, ,) (NP (DT a) (NN diaphragm)) (, ,) (CC and) (NP (JJ mammary) (NNS glands)))))))))) (. .)))
Mammals (Mammalia) are a group of tetrapods that have hair, a four-chambered heart, a diaphragm, and mammary glands.
(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))))) (. .)))