Barnacles are arthropods that cannot move on their own, so they hitch a ride on whales and filter out food from water as it passes by. The whales are unaffected by the barnacles.
What symbiotic relationship is this?
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The symbiotic relationship between barnacles and whales described in the scenario is known as commensalism. In commensalism, one species (the barnacles) benefits from the relationship, while the other species (the whales) is neither harmed nor benefitted.
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