During Mesozoic, the swim bladder, which evolved from the lungs of some fish, allowed fish to regulate their

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The swim bladder, which evolved from the lungs of some fish during the Mesozoic, allowed fish to regulate their buoyancy by controlling the amount of gas that was present within the bladder. This enabled fish to maintain a stable position within the water column without having to constantly swim or expend energy. Therefore, choice C is the best answer.

During Mesozoic, the Swim Bladder, Which Evolved from the Lungs