( ( A population ) ( ( is ( ( a group ) ( of ( individuals ( of ( ( the ( same species ) ) ( living ( in ( ( the ( same area ) ) ( at ( the ( same time ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN population)) (VP (VBZ is) (NP (NP (DT a) (NN group)) (PP (IN of) (NP (NP (NNS individuals)) (PP (IN of) (NP (NP (DT the) (JJ same) (NN species)) (VP (VBG living) (PP (IN in) (NP (NP (DT the) (JJ same) (NN area)) (PP (IN at) (NP (DT the) (JJ same) (NN time)))))))))))) (. .)))
A population is a group of individuals of the same species living in the same area 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))))) (. .)))