( ( ( The ability ) ( for ( ( ( ( ( reptiles , ) birds ) , ) and ) some ) ) ) ( ( mammals ( to ( reproduce ( utilizing ( the ( amniotic egg ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN ability)) (PP (IN for) (NP (NP (NNS reptiles)) (, ,) (NP (NNS birds)) (, ,) (CC and) (NP (DT some))))) (VP (VBZ mammals) (S (VP (TO to) (VP (VB reproduce) (S (VP (VBG utilizing) (NP (DT the) (JJ amniotic) (NN egg)))))))) (. .)))
The ability for reptiles, birds, and      some mammals to reproduce utilizing the amniotic egg.
(ROOT (S (NP (NNS Mammals)) (VP (VP (VBP have) (NP (CD four) (NNS limbs))) (CC and) (VP (VBP produce) (NP (JJ amniotic) (NNS eggs)))) (. .)))