The biological process through which animals maintain internal equilibrium is known as homeostasis. This involves the regulation of various physiological parameters, such as temperature, pH, and ion concentrations, to keep conditions suitable for cellular functions. Homeostasis is achieved through complex feedback mechanisms, including thermoregulation and the actions of various organ systems, such as the nervous and endocrine systems. Effective homeostatic processes enable organisms to adapt to environmental changes, ensuring overall health and function in response to internal and external challenges.