( ( A population ) ( ( is ( ( a group ) ( of ( organisms ( of ( ( the ( same species ) ) ( ( occupying ( a ( particular space ) ) ) ( at ( a ( particular time ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN population)) (VP (VBZ is) (NP (NP (DT a) (NN group)) (PP (IN of) (NP (NP (NNS organisms)) (PP (IN of) (NP (NP (DT the) (JJ same) (NN species)) (VP (VBG occupying) (NP (DT a) (JJ particular) (NN space)) (PP (IN at) (NP (DT a) (JJ particular) (NN time)))))))))) (. .)))
A population is a group of organisms of the same species occupying a particular space at a particular 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))))) (. .)))