( ( A frog ) ( ( has ( ( lungs , ) ( tadpoles none ) ) ) . ) )
(ROOT (S (NP (DT A) (NN frog)) (VP (VBZ has) (NP (NP (NNS lungs)) (, ,) (NP (JJ tadpoles) (NN none)))) (. .)))
A frog has lungs, tadpoles none.
(ROOT (S (NP (DT A) (NN frog)) (VP (VBZ develops) (NP (PRN (-LRB- -LRB-) (NP (NN a/an)) (-RRB- -RRB-)) (NNS lungs)) (SBAR (IN as) (S (NP (PRP it)) (VP (VBZ changes) (PP (IN from) (NP (DT a) (NN tadpole))) (PP (TO to) (NP (DT an) (JJ adult) (NN frog))))))) (. .)))