( ( populations ( at ( a ( specific place ) ) ) ) ( ( form ( a community ) ) . ) )
(ROOT (S (NP (NP (NNS populations)) (PP (IN at) (NP (DT a) (JJ specific) (NN place)))) (VP (VBP form) (NP (DT a) (NN community))) (. .)))
populations at a specific place form a community .
(ROOT (S (NP (NP (NNS Populations)) (VP (VBG living) (PP (IN in) (NP (CD one) (NN place))))) (VP (VBP form) (NP (DT a) (NN community))) (. .)))