The characteristic of life that best describes the process of homeostasis is regulation. Homeostasis refers to the ability of an organism to maintain stable internal conditions despite changes in the external environment. This regulation involves various physiological processes that help organisms keep their internal environment, such as temperature, pH, and fluid balance, within narrow limits.
For example, when humans get too hot, our bodies sweat to cool down through evaporative cooling. Similarly, when we are cold, blood vessels constrict, and we may shiver to generate heat. These processes exemplify how living organisms actively regulate their internal conditions to survive and function effectively.