Parasitism is where one organism benefits at a detrimental effect on the other. An example of this is a Leech on a Human. The Leech sucks the blood of the Human to feed, thus benefitting in the relationship and the Human loses blood, which is detrimental. In a small amount of cases Leeches have been known to transmit pathogens to Humans, but only several reported cases of this have ever been reported.The Evolution of the Parasite is closely linked to that of its Host, because if the Host were to evolve a way of defending itself against the Parasite then the existence of the Parasite is threatened. Therefore, the Parasite has to either Evolve too, or Die off.
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