As ian - American ▁horror ▁films <0x0A> </s> ▁Compet ition ▁is ▁an ▁ ▁interaction ▁between ▁organ isms ▁or ▁species ▁in ▁which ▁both ▁the ▁organ isms ▁or ▁species ▁are ▁har med . ▁Limited ▁supply ▁of ▁at ▁least ▁one ▁resource ▁( such ▁as ▁food , ▁water , ▁and ▁territory ) ▁used ▁by ▁both ▁can ▁be ▁a ▁factor . ▁Compet ition ▁both ▁within ▁and ▁between ▁species ▁is ▁an ▁important ▁topic ▁in ▁e col ogy , ▁especially ▁community ▁e col ogy . ▁Compet ition ▁is ▁one ▁of ▁many ▁interact ing ▁bi otic ▁and ▁ab i otic ▁factors ▁that ▁affect ▁community ▁structure . ▁Compet ition ▁among ▁members ▁of ▁the ▁same ▁species ▁is ▁known ▁as ▁in tras pec ific ▁competition , ▁while ▁competition ▁between ▁individuals ▁of ▁different ▁species ▁is ▁known ▁as ▁inter specific ▁competition . ▁Compet ition ▁is ▁not ▁always ▁straightforward , ▁and ▁can ▁occur ▁in ▁both ▁a ▁direct ▁and ▁indirect ▁fashion . ▁▁ ▁According ▁to ▁the ▁compet itive ▁ex clusion ▁principle , ▁species ▁less ▁su ited ▁to ▁comp ete ▁for ▁resources ▁should ▁either ▁adapt ▁or ▁die ▁out , ▁although ▁compet itive ▁ex clusion ▁is ▁rarely ▁found ▁in ▁natural ▁e cos ystem s . ▁According ▁to ▁evolution ary ▁theory , ▁this ▁competition ▁within ▁and ▁between ▁species ▁for ▁resources ▁is ▁important ▁in ▁natural ▁selection . ▁However , ▁competition ▁may ▁play ▁less ▁of ▁a ▁role ▁than ▁expansion ▁among ▁larger ▁cl ades ; ▁this ▁is ▁term ed ▁the ▁' Ro om ▁to ▁Ro am ' ▁hypothesis . ▁ ▁By ▁mechanism ▁ ▁Compet ition ▁occurs ▁by ▁various ▁mechan isms , ▁which ▁can ▁generally