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Symbiosis is when two dIfferent living organisms interact with each other on a biological level in a close and long term environment. They are three main different types of symbiosis. Mutualism is where both organisms benefit (sharks and remora fish - the fish eat parasites off the sharks body and mouth. The shark keeps healthy and the fish get food). Commensalism is where one organism benefits and the other isn’t affected (clownfish live in an anemone where the anemone’s sting protects the clownfish as they are immune to the sting. The anemone is not affected by the clownfish). Finally there is parasitism, which as it sounds, one organism benefits, the other is harmed by the relationship (a tick that lives on a dog or cat benefits from living on the animal, but the animal loses blood - animals do not have to be killed in a parasitic relationship, although it also qualifies).