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Question

Small fish stuck near the bottom of a shark and derives its nutrition from it. This kind of association is called

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Solution

Small fish or sucker fish (Echeneis) attaches itself to the under surface of shark with the help of its dorsal fin which is modified into holdfast. Small fish derives its nutrition from shark. This association is known as commensalism. Shark is neither benefited nor harmed while the small fish derives it benefit.

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