Functional changes refer to alterations in the behavior, performance, or capabilities of a system or organism in response to external stimuli, environmental factors, or internal processes. In the context of research, functional changes may be studied in various fields such as biology, psychology, medicine, engineering, and sociology. Researchers may investigate how functional changes occur, what factors influence them, and how they impact the overall functioning of complex systems. This research area is important for understanding adaptive responses, resilience, and the mechanisms underlying various processes in living organisms and systems. Overall, studies on functional changes contribute to our knowledge of how systems adapt, evolve, and maintain stability in the face of changing conditions, providing insights for various applications in fields such as healthcare, technology, and environmental science.