Mutualism [ˈmjuːtʃʊəˌlɪzəm]
Mutualism is a symbiotic relationship in which both of the interacting species receive some form of benefit. These kinds of mutualistic connections are most probable to flourish between organisms with generally distinct living requirements.
To put it simply, both organisms benefit from the interaction.
Types of Mutualistic Interactions
Resource-resource relationships
As the most common form of mutualistic interaction, this relationship occurs when a certain type of resource is traded for a different type of resource.
For example, coral polyps rely upon the photosynthesis process achieved by zooxanthellae, while zooxanthellae rely on nitrogen that the coral polyps acquire from hunting during the night.
Service-resource relationships
As stated in the name itself, this interaction occurs in which organisms trades a resource for a service in return.
For example, the pollination process involving angiosperms and insects such as bees and wasps.
Service-service relationships
These types of relations are quite rare. This situation occurs when services are traded between interacting organisms.
For example, the genus Pseudomyrmex and assorted Acacia tree species' mutualistic interaction.
The Acacia trees give shelter and food; the ants defend these trees from parasites.