An animal that lives mainly in water is least likely to use __Gills_____ to obtain oxygen.
Explanation:
Gills are structurally adapted to extract oxygen from water. Their efficiency in extracting oxygen from water is attributed to its large surface area, high vascularization, and the use of counter-current flow to improve gaseous exchange. When gills are exposed to air, they collapse because they do not have structural support such as the lungs. This reduces their surface area leading to asphyxiation. The density of water helps keep the gill lamellae apart in water.
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