( Populations ( ( are ( groups ( of ( individuals ( belonging ( to ( ( the ( same species ) ) ( that ( live ( in ( ( the ( same region ) ) ( at ( the ( same time ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Populations)) (VP (VBP are) (NP (NP (NNS groups)) (PP (IN of) (NP (NP (NNS individuals)) (VP (VBG belonging) (PP (TO to) (NP (NP (DT the) (JJ same) (NN species)) (SBAR (WHNP (WDT that)) (S (VP (VBP live) (PP (IN in) (NP (NP (DT the) (JJ same) (NN region)) (PP (IN at) (NP (DT the) (JJ same) (NN time))))))))))))))) (. .)))
Populations are groups of individuals belonging to the same species that live in the same region at the same time.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (DT a) (NN group)) (PP (IN of) (NP (NP (NNS organisms)) (PP (IN of) (NP (DT the) (JJ same) (NN species)))))) (SBAR (IN that) (S (VP (VBP live) (PP (IN in) (NP (DT the) (JJ same) (NN area)))) (NP (DT a) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN population))))) (. .)))