The parasitic relationship between parasitic copepods and fish in the marine biome is an example of parasitism. Parasitic copepods attach themselves to the bodies of fish, feeding off their blood and tissues and causing harm to the fish. The copepods benefit from the nutrients they extract from the fish, while the fish suffers from the negative effects of the parasitic infestation.

Rephrase this sentence like a biology 9th grader

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Parasitic copepods in the ocean attach themselves to fish, feeding on their blood and tissues. This harms the fish while benefiting the copepods.