Step 1: Commensalism is an interaction where one species benefits and the other is neither harmed nor benefited. Step 2: The clownfish lives among the stinging tentacles of the sea anemone. The stinging tentacles provide the fish protection from predators, which stay away from the anemone. Step 3: The sea anemone does not appear to derive any benefit or suffer any harm from the presence of the clownfish.