( ( factors ( ( natural selection ) 5 ) ) . )
(ROOT (NP (NP (NNS factors)) (NP (NP (JJ natural) (NN selection)) (NP (CD 5))) (. .)))
factors natural selection 5.
(ROOT (S (NP (NNP Community) (NNS interactions)) (VP (VBP are) (NP (NP (JJ important) (NNS factors)) (PP (IN in) (NP (JJ natural) (NN selection))))) (. .)))