If a symbiont either harms or lives at the expense of another organism,the relationship is called

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Parasitism is the relationship in which one organism benefits at the expense of another organism. In this relationship, the symbiont (parasite) harms or lives at the expense of the host organism. Symbiosis is a more general term that can refer to any close, long-term relationship between two different species. Commensalism is a relationship in which one organism benefits and the other is neither helped nor harmed, whereas pathogenicity refers specifically to the ability of a symbiont to cause disease in its host.

If a Symbiont Either Harms or Lives at the Expense