Amphibians are often described as having 'double respiration.' Which two surfaces are primarily used for gas exchange in most adult frogs?
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Correct answer: Lungs and moist skin, used simultaneously in adults
Adult amphibians use lungs for pulmonary respiration and their moist, highly vascularized skin for cutaneous respiration. Cutaneous respiration is so efficient that some lungless salamanders rely on it exclusively.
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