( ( ( competitive exclusion ) ( ( A theory ) ( that ( ( ( no ( two populations ) ) ( of ( different species ) ) ) ( will ( ( ( occupy ( the ( same niche ) ) ) and ) ( ( compete ( for ( ( exactly ( the ( same resources ) ) ) ( in ( the ( same habitat ) ) ) ) ) ) ( for ( very long ) ) ) ) ) ) ) ) ) ; )
(ROOT (NP (NP (NP (JJ competitive) (NN exclusion)) (SBAR (NP (DT A) (NN theory)) (IN that) (S (NP (NP (DT no) (CD two) (NNS populations)) (PP (IN of) (NP (JJ different) (NNS species)))) (VP (MD will) (VP (VP (VB occupy) (NP (DT the) (JJ same) (NN niche))) (CC and) (VP (VB compete) (PP (IN for) (NP (NP (RB exactly) (DT the) (JJ same) (NNS resources)) (PP (IN in) (NP (DT the) (JJ same) (NN habitat))))) (PP (IN for) (ADJP (RB very) (JJ long))))))))) (: ;)))
competitive exclusion A theory that no two populations of different species will occupy the same niche and compete for exactly the same resources in the same habitat for very long;
(ROOT (S (NP (JJ Competive) (NN exclusion) (NN princple)) (VP (VBZ explains) (SBAR (WHADVP (WRB why)) (S (NP (CD two) (JJ different) (NNS species)) (VP (MD can) (RB not) (VP (VB occupy) (NP (NP (DT the) (JJ same) (NN niche)) (PP (IN in) (NP (DT the) (JJ same) (NN place)))) (PP (IN for) (ADJP (RB very) (JJ long)))))))) (. .)))