Biological Adaptation

Biological adaptation refers to the processes and traits by which organisms become suited to their environments, enhancing survival and reproduction, whether through genetic change across generations or through physiological adjustment within a lifetime. Charles Darwin's theory of natural selection explains how advantageous heritable traits spread within populations, and the modern synthesis integrated this idea with genetics. The concept has had a lasting influence on sociology. Herbert Spencer applied evolutionary thinking to society, coining the phrase survival of the fittest and inspiring social Darwinism, a doctrine later discredited for justifying inequality and imperialism. Emile Durkheim drew on biological analogies in explaining the division of labor, and Talcott Parsons identified adaptation as one of four functional requirements of any social system. Gerhard Lenski's ecological-evolutionary theory linked social development to technology and environment, while Edward O. Wilson's sociobiology sought evolutionary explanations for social behavior and attracted sharp criticism. Contemporary sociologists generally reject biological determinism and emphasize that human adaptation is largely cultural, institutional, and technological. Biological adaptation nevertheless remains relevant to debates about health, environment, human variation, and the relationship between nature and society.