There are three different types of symbiotic relationships: mutualism, commensalism, and parasitism. Mutualism: both partners benefit. An example of mutualism. Commensalism is a relationship between two species where one species derives a Commensalism is much more difficult to demonstrate than mutualism. Commensalism: Commensalism, in biology, a relationship between two species in which one obtains benefits from the other without harming or benefiting it.
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