( ( Describe ( ( the difference ) ( between ( gradualism ( and ( punctuated equilibrium ) ) ) ) ) ) . )
(ROOT (S (VP (VB Describe) (NP (NP (DT the) (NN difference)) (PP (IN between) (NP (NN gradualism) (CC and) (NN punctuated) (NN equilibrium))))) (. .)))
Describe the difference between gradualism and punctuated equilibrium.
(ROOT (S (NP (NNP Darwin)) (VP (VBD believed) (PP (IN in) (NP (NN gradualism)))) (. .)))