Mutualism is referred to as the interspecific interaction in which both the interacting species are benefited from each other.
For example, lichens represent close association between fungus and photosynthetic bacteria.
Competition is a type of interaction due to limited resources between closely related species where they compete for the same resource and both species suffer.
For example, In South American lakes, visiting flamingos and resident fishes compete for zooplanktons.
Parasitism is the mode of interaction between two species in which one species (parasite) depends on the other species (host) for food and shelter, and in the process damages the host.
For example, human liver fluke depends on two hosts, a snail and a fish, to complete its life cycle.
