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Concepts In Homeostais Q. Define Homoestasis, osmoregulation, excretion and thermoregulation. Homeostasis: The protection of internal environment of an organism from the harms of fluctuations taking place in external environment is called Homestasis. Osmoregulation: The mechanism of regulation of solute and the gain and loss of water between organism and environment is known as osmoregulation. Excreation: The mechanism which eliminate metabolic wastes especially nitrogenous wastes is called excreation. Thermoregulation: Maintenance of internal temperature which in a tolerable range is designated as thermoregulation  e.g. In human temperature is maintained between 36.1 to 37.8 centigrade. Importance of Homeostasis: The homeostasis keeps the internal fluctuations in a narrow range with various control system compared to winder external environment. Homeostasis is the central requirement in the maintenance of an organism, which make adaptions in the constant changing