Many amphibians, such as frogs undergo metamorphosis. They begin life in the water and live on land as adults. They have moist, scaleless skin and they are cold blooded. They absorb water and undergo gas exchange through their skin. Amphibians adjust to the temperature of their surroundings by becoming that temperature.
Their skin absorbs water and oxygen, but they are vulnerable to dehydration. They are often found near ponds, marshlands, swamps, and other areas where fresh water is available. Some amphibians are poisonous. They can also change the color of their skin.
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