▁competition ▁for ▁soil ▁resources . ▁ ▁By ▁tax onom ic ▁relationship ▁ ▁Compet ition ▁can ▁occur ▁between ▁individuals ▁of ▁the ▁same ▁species , ▁called ▁in tras pec ific ▁competition , ▁or ▁between ▁different ▁species , ▁called ▁inter specific ▁competition . ▁Studies ▁show ▁that ▁in tras pec ific ▁competition ▁can ▁reg ulate ▁population ▁dynamics ▁( changes ▁in ▁population ▁size ▁over ▁time ). ▁This ▁occurs ▁because ▁individuals ▁become ▁crow ded ▁as ▁a ▁population ▁grows . ▁Since ▁individuals ▁within ▁a ▁population ▁require ▁the ▁same ▁resources , ▁crow ding ▁causes ▁resources ▁to ▁become ▁more ▁limited . ▁Some ▁individuals ▁( typ ically ▁small ▁ju ven iles ) ▁eventually ▁do ▁not ▁ac quire ▁enough ▁resources ▁and ▁die ▁or ▁do ▁not ▁reproduce . ▁This ▁reduces ▁population ▁size ▁and ▁slow s ▁population ▁growth . ▁ ▁Species ▁also ▁interact ▁with ▁other ▁species ▁that ▁require ▁the ▁same ▁resources . ▁Con sequently , ▁inter specific ▁competition ▁can ▁alter ▁the ▁sizes ▁of ▁many ▁species ' ▁populations ▁at ▁the ▁same ▁time . ▁Exper iments ▁demonstrate ▁that ▁when ▁species ▁comp ete ▁for ▁a ▁limited ▁resource , ▁one ▁species ▁eventually ▁drives ▁the ▁populations ▁of ▁other ▁species ▁ext inct . ▁These ▁experiments ▁suggest ▁that ▁compet ing ▁species ▁cannot ▁co exist ▁( they ▁cannot ▁live ▁together ▁in ▁the ▁same ▁area ) ▁because ▁the ▁best ▁compet itor ▁will ▁exclude ▁all ▁other ▁compet ing ▁species . ▁ ▁In tras pec ific ▁ ▁In tras pec ific ▁competition ▁occurs ▁when ▁members ▁of ▁the ▁same ▁species ▁comp ete ▁for ▁the ▁same ▁resources ▁in ▁an ▁e cos ystem . ▁ ▁In ters pec ific ▁