Water plays a crucial role in thermoregulation, helping organisms maintain a stable internal temperature despite external fluctuations. It absorbs and releases heat slowly due to its high specific heat capacity, acting as a buffer against rapid temperature changes. In humans and other mammals, sweating facilitates cooling, as evaporating sweat removes heat from the skin surface. In plants, transpiration helps regulate temperature and maintain photosynthesis by cooling leaves. Additionally, water's role in metabolic processes and cellular functions underlines its importance in overall homeostasis and organismal survival.