Biological systems are fundamentally open systems and thus non-equilibrium. According to Prigogine's postulate, the overall change in entropy dS of an open system can occur independently either due to the exchange process with the external environment (deS) or due to internal irreversible processes (diS). Show that for an isolated system we inevitably come to the classical formulation of the second law of thermodynamics. What can be said about the change in entropy in internal processes?

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