( ( ( ( ( C 4 ) metabolism ) ( Amniotic egg ) ) ( ( Four-chambered heart ) ( Pollen 75 ) ) ) . )
(ROOT (NP (NP (QP ($ C) (CD 4) (CD metabolism)) (JJ Amniotic) (NN egg)) (NP (NP (JJ Four-chambered) (NN heart)) (NP (NNP Pollen) (CD 75))) (. .)))
C 4 metabolism Amniotic egg Four-chambered heart Pollen 75.
(ROOT (S (NP (NNS Mammals)) (VP (VP (VBP have) (NP (CD four) (NNS limbs))) (CC and) (VP (VBP produce) (NP (JJ amniotic) (NNS eggs)))) (. .)))