( Mammals ( ( have ( a ( four-chambered heart ) ) ) . ) )
(ROOT (S (NP (NNS Mammals)) (VP (VBP have) (NP (DT a) (JJ four-chambered) (NN heart))) (. .)))
Mammals have a four-chambered heart.
(ROOT (S (NP (DT All) (NNS mammals)) (VP (VBP have) (NP (CD four) (NNS limbs))) (. .)))