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What does Gill mean? - Definitions for Gill A gill ( (listen)) is a respiratory organ that many aquatic organisms use to extract dissolved oxygen from water and to excrete carbon dioxide The gills of some species, such as hermit crabs, have adapted to allow respiration on land provided they are kept moist
How Do Gills Work? - American Oceans Gills are respiratory organs found in aquatic animals, including fish, sharks, lampreys, and hagfish They are responsible for extracting oxygen from water, which is then used to sustain the animal’s metabolism Gills are a specialized adaptation that has evolved in response to the unique challenges of living in an aquatic environment