The term symbiosis can be used to broadly refer to these types of relationships as it directly translates to mean living together (sym: with; bio: life). Symbiosis is the ecological relationship between two or more organisms living closely together with some form of feeding relationship involved. The three main symbiotic relationships are: - Mutualism, where both organisms benefit. - Commensalism, where one organism benefits while the other organism is not harmed. - Parasitism, where one organism benefits and causes harm to the other organism. Mutualism. This is a beneficial relationship to both partners of different species living together. For example a bee and a pollinating flower. The bee gains nectar from the flower for survival, as it uses the bee to carry its pollen to other flowers.