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Symbiotic Relationships Symbiosis • Relationships between organisms in a community. • Include both beneficial & harmful relationships Commensalism – One species benefits, other not harmed • Barnacle living on whale’s back • Birds & grazing animals • Clown fish and stingray Mutualism – Two species live together & both benefit • Tiny fish living within larger fish mouth • Stinging ants & bull’s horn acacias Parasitism – One organism lives on or inside another organism & harms it. It needs a host to survive. • Leech • Lice • Tapeworm Predator and Prey • Prey – food source • Predator - hunts the prey Inter Specific Competition • Is a form of competition in which individuals of Different species compete for the same resource in an ecosystem • Example: Food Intra Specific Competition • Form of competition in which members of the SAME species vie for the same resource in an ecosystem • Example: food, light, mates