A frog is an amphibian, but adult frogs do not have gills. They absorb oxygen from the water through their skins, using special blood vessels. If the oxygen level in water is too low, frogs will move around to increase the water flow across the skin. Some frogs have creased skins that can increase their surface area.
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Cutaneous respiration in frogs may be the primary respiratory mode during colder temperature.frogs using cutaneous respiration have extensive folds of skins to increase the rate of respiration