( ( Population ( ( The sum ) ( of ( ( all ( the ( same species ) ) ) ( in ( a ( given area ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Population) (NP (NP (DT The) (NN sum)) (PP (IN of) (NP (NP (PDT all) (DT the) (JJ same) (NNS species)) (PP (IN in) (NP (DT a) (VBN given) (NN area))))))) (. .)))
Population The sum of all the same species in a given 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.