The freshwater aquatic larvae of the Chaoborus midge are the world's only truly planktonic insects, regulating their buoyancy using two pairs of internal air-filled sacs, one in the thorax and the ...
Chronic emphysema is a type of chronic obstructive pulmonary disease (COPD) caused by damage to the air sacs in the lungs. Although there is no cure, you can manage the disease with lifestyle changes ...
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