( ( ( Gradualism , ) ( ( catastrophism and ) ( punctuated equilibrium ) ) ) . )
(ROOT (NP (NP (NNP Gradualism)) (, ,) (NP (NP (NN catastrophism)) (CC and) (NP (JJ punctuated) (NN equilibrium))) (. .)))
Gradualism, catastrophism and punctuated equilibrium.
(ROOT (S (NP (NNP Darwin)) (VP (VBD believed) (PP (IN in) (NP (NN gradualism)))) (. .)))