( ( The ( amniotic egg ) ) ( ( is ( ( the ( key feature ) ) ( in ( ( the development ) ( of ( the reptiles ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ amniotic) (NN egg)) (VP (VBZ is) (NP (NP (DT the) (JJ key) (NN feature)) (PP (IN in) (NP (NP (DT the) (NN development)) (PP (IN of) (NP (DT the) (NNS reptiles))))))) (. .)))
The amniotic egg is the key feature in the development of the reptiles.
(ROOT (S (NP (JJS Most) (NNS reptiles)) (VP (VBD lay) (NP (JJ amniotic) (NNS eggs))) (. .)))