( ( ( population ( ( A group ) ( of ( individuals ( from ( the ( same species ) ) ) ) ) ) ) ( ( that lives ) ( in ( the ( same area ) ) ) ) ) . )
(ROOT (NP (NP (NN population)) (NP (NP (DT A) (NN group)) (PP (IN of) (NP (NP (NNS individuals)) (PP (IN from) (NP (DT the) (JJ same) (NN species)))))) (NP (NP (DT that) (NNS lives)) (PP (IN in) (NP (DT the) (JJ same) (NN area)))) (. .)))
population  A group of individuals from the same species that lives in the same 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))))) (. .)))