(1) Algae and fungi in lichens:-
- This is an example of mutualism in which both are benefited
- Fungi provide protection and helps in absorbing water and minerals where as the algae prepare food for the fungus.
(2) Head louse and human:
This is an example of ectoparasitism the parasite gets shelter as well as food from human’s head.
(3) Hermit crab and sea anemone:-
This is an example of commensalism in which sea anemone gets benefit for moving to places rich in nutrients while the hermit crab neither benefitted nor harmed.