The mechanism by which organisms respond to changes in their environment is termed homeostasis. Homeostasis involves a range of physiological processes that help maintain internal balance despite external fluctuations. For example, humans regulate temperature, pH, and glucose levels to stay within optimal ranges. When changes occur, feedback systems activate to counteract these changes, ensuring stability. Understanding homeostasis is critical in biology, as it explains how organisms adapt, survive, and thrive in diverse environments and the impact of stressors on health.