( Evolution ( ( is ( ( a ( percentage change ) ) ( in ( ( the ( heritable traits ) ) ( in ( ( a population ) ( over ( ( ( one or ) more ) generations ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Evolution)) (VP (VBZ is) (NP (NP (DT a) (NN percentage) (NN change)) (PP (IN in) (NP (NP (DT the) (JJ heritable) (NNS traits)) (PP (IN in) (NP (NP (DT a) (NN population)) (PP (IN over) (NP (QP (CD one) (CC or) (JJR more)) (NNS generations))))))))) (. .)))
Evolution is a percentage change in the heritable traits in a population over one or more generations.
(ROOT (S (NP (NNP Evolution)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (NNS organisms)) (VP (VB acquire) (CC and) (VB pass) (PP (IN on) (NP (JJ new) (NNS traits))) (PP (IN from) (NP (NP (CD one) (NN generation)) (PP (TO to) (NP (DT the) (JJ next) (NN generation))))))))) (. .)))