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Pneumatic sacs are air-filled structures found in various organisms, particularly in some fish and amphibians, that serve as buoyancy aids. In fish, these sacs, known as swim bladders, help regulate buoyancy and maintain stability in water. In other contexts, pneumatic sacs can refer to air-filled cavities in certain invertebrates that assist in respiration or locomotion. Overall, they play a crucial role in the physiology of the organisms that possess them.

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9mo ago

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