A gill or gill-like breathing structure found in aquatic animals such as fish, mollusks, and some crustaceans.
From Greek 'brankhia' (gill), from the root meaning 'that which pertains to the throat.' The term entered scientific Latin and then modern scientific terminology for respiratory organs.
Fish gills are nature's counter-current heat exchangers—water flows one direction over tissue flowing the other way, allowing fish to extract 80% of dissolved oxygen, while your lungs only manage 25%.
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