Freshwater leeches are segmented worms that latch onto fish or other animals and suck their blood. The fish are harmed, but are not killed. The leeches drink blood until they are full, and then they let go.
What symbiotic relationship is this?
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The symbiotic relationship described in the scenario is parasitism. In this relationship, the leeches benefit by obtaining nourishment from the blood of the fish or other animals, while the fish are harmed by losing blood and potentially suffering negative effects from the leech's feeding activity.
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