( ( Natural Selection ) ( ( is ( ( the engine ) ( for ( Darwin Evolution ) ) ) ) . ) )
(ROOT (S (NP (NNP Natural) (NNP Selection)) (VP (VBZ is) (NP (NP (DT the) (NN engine)) (PP (IN for) (NP (NNP Darwin) (NNP Evolution))))) (. .)))
Natural Selection is the engine for Darwin Evolution.
(ROOT (S (NP (NNP Evolution)) (VP (VBZ occurs) (PP (IN by) (NP (NP (JJ natural) (NN selection)) (, ,) (NP (NP (DT a) (NN process)) (SBAR (WHADVP (WRB whereby)) (S (NP (JJ better-adapted) (NNS members)) (VP (VBP pass) (PRT (RP along)) (NP (PRP$ their) (NNS traits)) (, ,) (PP (VBG according) (PP (TO to) (NP (NN darwin))))))))))) (. .)))