( ( ( The theory ) ( of ( natural selection ) ) ) ( ( maintains ( that ( ( ( some individuals ) ( in ( a population ) ) ) ( ( ( have ( traits ( that ( enable ( to ( ( ( survive and ) produce ) ( more offspring ) ) ) ) ) ) ) , ) ( while ( ( other individuals ) ( have ( traits ( that ( ( ( are detrimental ) and ) ( may ( cause ( them ( to ( die ( before reproducing ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN theory)) (PP (IN of) (NP (JJ natural) (NN selection)))) (VP (VBZ maintains) (SBAR (IN that) (S (NP (NP (DT some) (NNS individuals)) (PP (IN in) (NP (DT a) (NN population)))) (VP (VBP have) (NP (NP (NNS traits)) (SBAR (WHNP (WDT that)) (S (VP (VBP enable) (S (VP (TO to) (VP (VB survive) (CC and) (VB produce) (NP (JJR more) (NN offspring))))))))) (, ,) (SBAR (IN while) (S (NP (JJ other) (NNS individuals)) (VP (VBP have) (NP (NP (NNS traits)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP are) (ADJP (JJ detrimental))) (CC and) (VP (MD may) (VP (VB cause) (S (NP (PRP them)) (VP (TO to) (VP (VB die) (PP (IN before) (NP (NN reproducing))))))))))))))))))) (. .)))
The theory of natural selection maintains that some individuals in a population have traits that enable to survive and produce more offspring, while other individuals have traits that are detrimental and may cause them to die before reproducing.
(ROOT (S (NP (JJ Natural) (NN selection)) (VP (VBZ is) (NP (NP (DT the) (NN process)) (SBAR (WHNP (WDT that)) (S (VP (VBZ allows) (NP (NNS organisms)) (PP (IN with) (NP (JJR better) (NNS traits) (S (VP (TO to) (VP (VB survive) (CC and) (VB produce))))))))))) (. .)))