( ( ( Therefor ( natural selection ) ) ( ( ( ( ( reduces ( ( the change ) ( in ( allele frequencies ) ) ) ) ( in ( ( a population ) ( over time ) ) ) ) , ) and ) is ) ) ( thus ( ( ( is NOT ) ( ( the process ) ( of evolution ) ) ) . ) ) )
(ROOT (S (NP (NP (JJ Therefor) (JJ natural) (NN selection)) (SBAR (S (VP (VP (VBZ reduces) (NP (NP (DT the) (NN change)) (PP (IN in) (NP (JJ allele) (NNS frequencies)))) (PP (IN in) (NP (NP (DT a) (NN population)) (PP (IN over) (NP (NN time)))))) (, ,) (CC and) (VP (VBZ is)))))) (ADVP (RB thus)) (VP (VBZ is) (ADVP (RB NOT)) (NP (NP (DT the) (NN process)) (PP (IN of) (NP (NN evolution))))) (. .)))
Therefor natural selection reduces the change in allele frequencies in a population over time, and is thus is NOT the process of evolution.
(ROOT (S (NP (NP (NNP Theevolution)) (PP (IN by) (NP (JJ natural) (NN selection) (NN theory)))) (VP (VBZ explains) (SBAR (WHADVP (WRB how)) (S (NP (NP (NNS populations)) (PP (IN of) (NP (NNS organisms)))) (VP (MD can) (VP (VB change) (PP (IN over) (NP (NN time)))))))) (. .)))