Clown fish hide among the tentacles of sea anemones. Unlike their predators, clown fish are immune to the stinging tentacles. Thus, clown fish are protected within the sea anemones. The sea anemones are neither helped nor harmed by the presence of the clown fish. The relationship between the clown fish and the sea anemone is a example of
A. competition
B. commensalism
C. mutualism
D. parasitism
E. predation
Answer: B. commensalism