( ( According ( to ( ( ( Darwin 's ) theory ) ( of evolution ) ) ) ) ( , ( ( natural selection ) ( ( means ( ( ( only ( the organisms ) ) ( best ( adapted ( to ( their environment ) ) ) ) ) ( tend ( to ( ( ( ( ( survive and ) transmit ) ( their ( genetic characters ) ) ) ( in ( increasing numbers ) ) ) ( to ( ( succeeding generations ) ( while ( ( those ( less adapted ) ) ( tend ( to ( be eliminated ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (VBG According) (PP (TO to) (NP (NP (NP (NNP Darwin) (POS 's)) (NN theory)) (PP (IN of) (NP (NN evolution)))))) (, ,) (NP (JJ natural) (NN selection)) (VP (VBZ means) (SBAR (S (NP (NP (RB only) (DT the) (NNS organisms)) (VP (RBS best) (VBN adapted) (PP (TO to) (NP (PRP$ their) (NN environment))))) (VP (VBP tend) (S (VP (TO to) (VP (VB survive) (CC and) (VB transmit) (NP (PRP$ their) (JJ genetic) (NNS characters)) (PP (IN in) (NP (VBG increasing) (NNS numbers))) (PP (TO to) (S (VP (VBG succeeding) (NP (NNS generations)) (SBAR (IN while) (S (NP (DT those) (JJR less) (NN adapted)) (VP (VBP tend) (S (VP (TO to) (VP (VB be) (VP (VBN eliminated)))))))))))))))))) (. .)))
According to Darwin's theory of evolution, natural selection means only the organisms best adapted to their environment tend to survive and transmit their genetic characters in increasing numbers to succeeding generations while those less adapted tend to be eliminated.
(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))))))))))) (. .)))