In the ocean, then anemone protects clownfish with its toxic tentacles and the clownfish rids the anemone of parasites and feeds it with fish poo. Is this an example of commensalism, mutualism, parasitism, or predation

This is an example of mutualism. Mutualism is a symbiotic relationship between two organisms where both parties benefit from the association. In this case, the clownfish and the anemone have a mutualistic relationship as the anemone provides protection for the clownfish with its toxic tentacles, while the clownfish, in return, helps rid the anemone of parasites and provides it with nutrients through its waste (fish poo).