Answer:
Symbiosis is the close association between individuals of different species, occurring within a whole community.
Mutualism is a relationship of symbiosis that is beneficial to both species involved. Some examples are as follows-
1. Sea anemone and hermit crab
The sea anemone gives protection for the hermit crab using its stinging cells and remoulds itself to fit the crab, whereas the crab provides the sea anemone with leftovers from its prey.
2. Nectar-producing plants and pollinators
The nectar-producing plants provide the insects with nectar as food supply whereas the insects help to pollinate the plants.
3. Ant-plant association
The ants keep insects that may eat the plant away from the plant whereas the plant provides it with nectar as a food supply.
4. Lichen
Lichen is made up of fungus and algae. The algae makes food for itself and the fungus through photosynthesis whereas the fungus anchors the plant and provides moisture.