The term for the ability of an organism to maintain a stable internal environment is called homeostasis. It involves various physiological processes that regulate factors such as temperature, pH, hydration, and nutrient levels. Homeostasis is crucial for survival, as it ensures that cellular conditions remain optimal for metabolic activities. Organisms utilize feedback mechanisms, including negative and positive feedback, to maintain this balance. Disruptions in homeostasis can lead to diseases or impaired functioning, highlighting its importance for health.