A swim bladder is a gas-filled sac that helps fish maintain buoyancy. The evolution of the swim bladder from lungs of an ancestral fish is an example of

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The swim bladder evolved from the lungs of an ancestral fish, which is an example of exaptation. Exaptation is the process by which a structure or behavior that evolved in one context is used for a different function. In this case, the lungs of an ancestral fish were not initially evolved for buoyancy, but were later adapted for that purpose.

A Swim Bladder Is a Gas-Filled Sac That Helps Fish