Parasitism is a type of non mutual relationship between organisms of different species where one organism, the parasite, benefits at the expense of the other, the host. (Wikipedia.com) http://en.wikipedia.org/wiki/Parasitism
a relationship between two species of organisms in which both benefit from the association. (Dictionary.com) http://dictionary.reference.com/browse/mutualism
commensalism is a class of relationship between two organisms where one organism benefits but the other is neutral (there is no harm or benefit)(Wikipedia.com)http://en.wikipedia.org/wiki/Commensalism
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