Answer :
This relationship is commensalism, when one benefits and the other is unharmed.
Answer: Commensalism
Explanation:
Commensalism is a symbiotic relationship in which two species live together and only one species receives the benefit of association and other remains unaffected.
The clownfish and sea anemones are the organisms which show commesalism. In this relationship the clownfish is receiving benefit as it derives shelter as well as food from sea anemone. The clownfish feeds over the leftovers of the other fishes and algae growing on the anemone. The sea anemone remains unaffected by this association.