( ( ( All ( the members ) ) ( of ( ( one ( particular species ) ) ( in ( a ( give area ) ) ) ) ) ) ( ( are ( called ( a population ) ) ) . ) )
(ROOT (S (NP (NP (PDT All) (DT the) (NNS members)) (PP (IN of) (NP (NP (CD one) (JJ particular) (NNS species)) (PP (IN in) (NP (DT a) (S (VP (VB give))) (NN area)))))) (VP (VBP are) (VP (VBN called) (NP (DT a) (NN population)))) (. .)))
All the members of one particular species in a give area are called a population.
(ROOT (S (NP (NP (DT All) (NNS members)) (PP (IN of) (NP (DT a) (NN species) (NN living)))) (ADVP (RB together)) (VP (VB form) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN population))) (. .)))