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A reliable source is one that provides a thorough, well-reasoned theory, argument, discussion, etc. based on strong evidence.
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AbdiRahman Ali Tuur , hope it helps
The answer is Equilibrium model of social change. A very long while back, Talcott Parsons in the year 1966, the main twentieth-century figure in the functionalist hypothesis, exhibited a harmony model of social change. Parsons said that society is dependably in a characteristic condition of balance, characterized as a condition of equivalent adjust among restricting powers.