( Population ( ecology ( ( studies ( groups ( of ( individuals ( of ( ( the ( same ( species living ) ) ) ( in ( a ( particular ( geographic area ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNP Population)) (ADVP (RB ecology)) (VP (VBZ studies) (NP (NP (NNS groups)) (PP (IN of) (NP (NP (NNS individuals)) (PP (IN of) (NP (NP (DT the) (JJ same) (NN species) (NN living)) (PP (IN in) (NP (DT a) (JJ particular) (JJ geographic) (NN area))))))))) (. .)))
Population ecology studies groups of individuals of the same species living in a particular geographic area.
(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))))) (. .)))