An organism that can live both in water and on land is termed an "amphibian." Amphibians, such as frogs, salamanders, and toads, have unique adaptations that allow them to thrive in both environments. They typically begin their life cycle in water as larvae, possessing gills for respiration, before undergoing metamorphosis to develop lungs for life on land. Amphibians possess permeable skin, which allows for gas exchange and hydration but makes them vulnerable to environmental changes. This dual capability is significant for their survival and ecological roles in both aquatic and terrestrial ecosystems. Amphibians are also crucial indicators of environmental health.