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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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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 __________.

User Mulllhausen
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exaptation - when a limb evolves and takes on a new function
User Nayive
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