( Gradualism ( ( contrasts ( with ( ( punctuationalism or ) saltationalism ) ) ) . ) )
(ROOT (S (NP (NNP Gradualism)) (VP (VBZ contrasts) (PP (IN with) (NP (NN punctuationalism) (CC or) (NN saltationalism)))) (. .)))
Gradualism contrasts with punctuationalism or saltationalism.
(ROOT (S (NP (NNP Darwin)) (VP (VBD believed) (PP (IN in) (NP (NN gradualism)))) (. .)))