The process by which organisms maintain equilibrium is called homeostasis. This biological mechanism allows organisms to regulate internal conditions, such as temperature, pH, hydration, and ion concentrations, despite external environmental changes. Homeostasis is crucial for survival, enabling organisms to function optimally and mitigate stresses. Various physiological systems, such as the endocrine and nervous systems, play significant roles in maintaining homeostasis through feedback loops that monitor and adjust bodily functions. Failure to achieve homeostasis can lead to illness or death.