( ( Niche theory ) ( ( says ( ( ( that ( ( each species ) ( has ( ( a ( unique ( ecological niche ) ) ) ( in ( an eco-system ) ) ) ) ) ) and ) ( that ( ( the species ) ( becomes ( adapted ( to ( fill ( that niche ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Niche) (NN theory)) (VP (VBZ says) (SBAR (SBAR (IN that) (S (NP (DT each) (NNS species)) (VP (VBZ has) (NP (NP (DT a) (JJ unique) (JJ ecological) (NN niche)) (PP (IN in) (NP (DT an) (NN eco-system))))))) (CC and) (SBAR (IN that) (S (NP (DT the) (NNS species)) (VP (VBZ becomes) (VP (VBN adapted) (S (VP (TO to) (VP (VB fill) (NP (DT that) (NN niche))))))))))) (. .)))
Niche theory says that each species has a unique ecological niche in an eco-system and that the species becomes adapted to fill that niche.
(ROOT (S (NP (DT Each) (NNS species)) (VP (VBZ has) (NP (NP (DT a) (JJ particular) (NN way)) (PP (IN of) (S (VP (VBG making) (NP (NP (DT a) (NN living)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (VP (VBN called) (NP (PRP$ its) (NN niche)))))))))))) (. .)))
Each species has a particular way of making a living, which is called its niche.