( ( A population ) ( ( ( is usually ) ( defined ( as ( all ( of ( ( the individuals ) ( of ( ( the ( same species ) ) ( that ( live ( in ( a ( given area ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN population)) (VP (VBZ is) (ADVP (RB usually)) (VP (VBN defined) (PP (IN as) (NP (NP (DT all)) (PP (IN of) (NP (NP (DT the) (NNS individuals)) (PP (IN of) (NP (NP (DT the) (JJ same) (NN species)) (SBAR (WHNP (WDT that)) (S (VP (VBP live) (PP (IN in) (NP (DT a) (VBN given) (NN area)))))))))))))) (. .)))
A population is usually defined as all of the individuals of the same species that live in a given 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))))) (. .)))