The scientific term for an organism's ability to maintain stable internal conditions is called homeostasis. This concept refers to the mechanisms that organisms employ to regulate temperature, pH, hydration, and other physiological parameters. Homeostasis is vital for survival, as it enables organisms to function optimally despite external environmental changes. Examples include thermoregulation in mammals and osmoregulation in fish. Disruptions in homeostatic balance can lead to diseases or even death, highlighting its significance in both ecology and medicine.