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Unlike mammals who absorb oxygen through the alveolar in their lungs, frogs are able to use their skin as a surface for gas exchange. The capillaries carry oxygen poor blood  underneath the skin so that oxygen in the air or water will be transported into the blood. 
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Frogs are amphibians. They respire either through their book lungs or skin. This is form of respiration in which exchange of gases occurs across the skin or gills or lungs.  
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