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  1. Jul 2023
    1. The notion of functional integration as a basis for biological identity was fully developed only in the 19th century, where it was transformed by the rise of both cell and evolutionary theory. Herbert Spencer
      • Herbert Spencer fully developed Digby's concept into the modern concept of functional integration
        • Spencer introduced the term "survival of the fittest"
        • ‘He tried to unite complex new findings about metabolism and organismic development with evolution and the seeming correspondence of organisms to their environments.
          • In The Principles of Biology (1864), Spencer wrote
            • a biological individual is one in which
            • the interdependence of the parts allows it to function and
            • respond to environmental change as a whole.
          • That is: ‘any concrete whole having a structure which enables it,
            • when placed in appropriate conditions,
        • to continuously adjust its internal relations to external relations, - so as to maintain the equilibrium of its functions.’