Which structure is derived from an ancestral air-breathing lung in ray-finned fishes, and is used to increase buoyancy?

Name: Which structure is derived from an ancestral air-breathing lung in ray-finned fishes, and is used to increase buoyancy?
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The swim bladder in ray-finned fishes is derived from an ancestral air-breathing lung and is used to regulate buoyancy, allowing the fish to maintain its depth in the water without expending energy.

Which Structure Is Derived from an Ancestral Air-Breathing Lung in Ray-Finned