In the scenario you described:
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Who benefits? The wrasse fish benefit, as they gain food by feeding on the parasites found on the black sea bass's body.
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Who is harmed? The black sea bass is harmed, as it is hosting parasites that can cause health issues or stress, even if the wrasse are removing these parasites.
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Who is neutral? There are no explicit neutral parties described within the interaction between the wrasse and black sea bass. However, other organisms in the ecosystem that are not directly involved could be considered neutral.
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What relationship is this? This relationship is an example of mutualism. Despite the fact that the black sea bass is harmed by having parasites (and thus may seem more closely related to parasitism), the overall relationship is typically classified as mutualistic because the wrasse provide a cleaning service that can improve the health of the black sea bass by removing harmful parasites.