Final answer:
In mutualism, both species involved benefit from the interaction, different from commensalism where only one benefits and the other is unaffected, and from parasitism where one benefits to the detriment of the other.
Step-by-step explanation:
When each of two species benefits from their interaction, the relationship is referred to as mutualism. This is a type of symbiotic relationship where both of the coexisting species gain some advantage. Unlike commensalism, where one species benefits while the other is neither helped nor harmed, or parasitism, where one species benefits at the expense of the other, mutualism provides a scenario where both species work together and benefit from the relationship. An example of mutualism is the relationship between bees and flowers, where bees get nectar for food while helping to pollinate the flowers.