( ( A population ) ( ( is ( ( an assemblage ) ( of ( organisms ( of ( ( the ( same species ) ) ( ( utilizing ( the resources ) ) ( in ( the ( same area ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN population)) (VP (VBZ is) (NP (NP (DT an) (NN assemblage)) (PP (IN of) (NP (NP (NNS organisms)) (PP (IN of) (NP (NP (DT the) (JJ same) (NN species)) (VP (VBG utilizing) (NP (DT the) (NNS resources)) (PP (IN in) (NP (DT the) (JJ same) (NN area)))))))))) (. .)))
A population is an assemblage of organisms of the same species utilizing the resources in the same area.
(ROOT (S (NP (NP (PDT All) (DT the) (NNS members)) (PP (IN of) (NP (NP (DT a) (NN species)) (SBAR (WHNP (WDT that)) (S (VP (VBP live) (PP (IN in) (NP (DT the) (JJ same) (NN area))))))))) (VP (VBP form) (NP (DT a) (NN population))) (. .)))
All the members of a species that live in the same area form a population.