Word Count : 256

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In amphibians, large cutaneous veins are present primarily due to their reliance on the skin for gas exchange and thermoregulation. Amphibians, unlike mammals and birds, have permeable skin that allows for the exchange of gases such as oxygen and carbon dioxide directly with the environment. This cutaneous respiration is especially important for species that live in aquatic or semi-aquatic environments, where their lungs may ________ _____ ______ ___ __________.
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