Correct Answer: Only skin

Solution : The correct option is Only skin

Frogs and other amphibians exchange gases through their skins during hibernation, including carbon dioxide and oxygen . Because of their porous skin, which enables them to collect and release gases directly from their surroundings, they can maintain minimum respiration even when their metabolic activity is substantially reduced. Amphibians, including toads, can live because of this adaptation, which causes their other physiological processes to slow down during hibernation.