Concept:Frogs use different respiratory organs based on their habitat. In water, they rely on cutaneous respiration through their skin.Explanation:In water, dissolved oxygen enters the frog's body by diffusing across its thin, moist skin, which is rich in blood capillaries. This is called cutaneous respiration. The skin acts as the main aquatic respiratory organ. On land, frogs also use the buccal cavity and lungs, but these are not functional underwater. The trachea is absent in frogs. Therefore, among the given options, the skin is the correct choice for respiration in water.Answer:B. skin
