( ( The ( term ( natural selection ) ) ) ( ( ( refers ( to ( the ( the process ) ) ) ) ( where ( ( ( heritable traits ) ( that ( make ( it ( ( more ( likely ( for ( an organism ) ) ) ) ( to ( ( survive ( long enough ) ) ( to reproduce ) ) ) ) ) ) ) ) ( ( become ( more common ) ) ( over ( ( successive generations ) ( of ( a population ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN term) (JJ natural) (NN selection)) (VP (VBZ refers) (PP (TO to) (NP (DT the) (DT the) (NN process))) (SBAR (WHADVP (WRB where)) (S (NP (NP (JJ heritable) (NNS traits)) (SBAR (WHNP (WDT that)) (S (VP (VBP make) (S (NP (PRP it)) (ADJP (RBR more) (JJ likely) (PP (IN for) (NP (DT an) (NN organism)))) (S (VP (TO to) (VP (VB survive) (ADVP (RB long) (RB enough)) (S (VP (TO to) (VP (VB reproduce)))))))))))) (VP (VBP become) (ADJP (RBR more) (JJ common)) (PP (IN over) (NP (NP (JJ successive) (NNS generations)) (PP (IN of) (NP (DT a) (NN population))))))))) (. .)))
The term natural selection refers to the the process where heritable traits that make it more likely for an organism to survive long enough to reproduce become more common over successive generations of a population.
(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))))))))))) (. .)))