( ( 555 ( www.ckl2.org Amphibians ) ) ( ( ( reproduce sexually ) ( with ( either ( external ( or ( internal fertilization ) ) ) ) ) ) . ) )
(ROOT (S (NP (CD 555) (JJ www.ckl2.org) (NNS Amphibians)) (VP (VB reproduce) (ADVP (RB sexually)) (PP (IN with) (NP (DT either) (JJ external) (CC or) (JJ internal) (NN fertilization)))) (. .)))
555     www.ckl2.org     Amphibians reproduce sexually with either external or internal fertilization.
(ROOT (S (NP (NNS Amphibians)) (ADVP (RB sexually)) (VP (VB reproduce) (PP (IN through) (NP (JJ external) (CC or) (JJ internal) (NN fertilization)))) (. .)))