The association between a shark and a remora is an example of commensalism. In this type of symbiotic relationship, one organism benefits while the other is neither helped nor harmed. The remora, a small fish, attaches itself to the shark using a suction cup on its head. This allows the remora to feed on the scraps of food left by the shark, such as bits of prey or parasites. The shark, on the other hand, is not affected by the presence of the remora. It neither gains nor loses anything from this relationship. Therefore, the correct answer is b) commensalism.
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