( ( ( A group ) ( of ( ( the ( same organism ) ) ( ( living together ) ( in ( an area ) ) ) ) ) ) ( ( is ( ( ( a population ) , ) ( such ( as ( ( a pride ) ( of lions ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN group)) (PP (IN of) (NP (NP (DT the) (JJ same) (NN organism)) (VP (VBG living) (ADVP (RB together)) (PP (IN in) (NP (DT an) (NN area))))))) (VP (VBZ is) (NP (NP (DT a) (NN population)) (, ,) (PP (JJ such) (IN as) (NP (NP (DT a) (NN pride)) (PP (IN of) (NP (NNS lions))))))) (. .)))
A group of the same organism living together in an area is a population, such as a pride of lions.
(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))))) (. .)))