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Many organisms become dependent on others and they need one another or one needs the other to survive Symbiotic interactions include forms of parasitism, mutualism, and commensalism. The first topic of discussion in symbiosis is parasitism Parasitism is when the relationship between two animal populations becomes intimate and the individuals of one population use the other population as a source of food and can be located in or on the host animal or animal of the other population(Boughey 1973)No known organism escapes being a victim of parasitism(Brum 1989) Parasitism is similar to preditation in the sense that the parasite derives nourishment from the host on which it feeds and the predator derives nourishment from the prey on which it feeds(Nitecki 1983) Parasitism is different from most normal predator prey situations because many different parasites can feed off of just one host but very few predators can feed on the same prey(1973)