( ( ( ( Competition ( may ( occur ( between ( ( two ( different species ) ) ( -LRB- ( ( interspecific competition ) -RRB- ) ) ) ) ) ) ) or ) ( competition ( may ( occur ( among ( members ( of ( ( the ( same species ) ) ( -LRB- ( ( intraspecific competition ) -RRB- ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NN Competition)) (VP (MD may) (VP (VB occur) (PP (IN between) (NP (NP (CD two) (JJ different) (NNS species)) (PRN (-LRB- -LRB-) (NP (JJ interspecific) (NN competition)) (-RRB- -RRB-))))))) (CC or) (S (NP (NN competition)) (VP (MD may) (VP (VB occur) (PP (IN among) (NP (NP (NNS members)) (PP (IN of) (NP (NP (DT the) (JJ same) (NN species)) (PRN (-LRB- -LRB-) (NP (JJ intraspecific) (NN competition)) (-RRB- -RRB-))))))))) (. .)))
Competition may occur between two different species (interspecific  competition) or competition may occur among members of the same species (intraspecific competition).
(ROOT (S (NP (NP (DT The) (CD two) (JJ basic) (NNS types)) (PP (IN of) (NP (NN competition)))) (VP (VBP are) (VP (VBN called) (NP (ADJP (JJ instraspecifc) (CC and) (JJ interspecific)) (NN competition)))) (. .)))