( ( A population ) ( ( is ( ( ( ( the number ) ( of ( organisms ( of ( the ( same kind ) ) ) ) ) ) , ) ( living ( in ( a ( specified area ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN population)) (VP (VBZ is) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS organisms)) (PP (IN of) (NP (DT the) (JJ same) (NN kind))))) (, ,) (VP (VBG living) (PP (IN in) (NP (DT a) (VBN specified) (NN area)))))) (. .)))
A population is the number of organisms of the same kind, living in a specified 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))))) (. .)))