Amphibians have a life cycle that includes time on land and in water, usually with a transformation. A tadpole is an amphibian that transforms and becomes a frog.
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Breathing Changes
Amphibians usually breathe through gills in water and lungs on land. Amphibians like salamanders are born with gills, which they lose as they grow.
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Sensitive Skin
Amphibians often have permeable skin that absorbs water and can be sensitive to changes. The moist skin of amphibians makes them vulnerable to pollution.