There was a time when workers were considered expendable. Before the evolution of HR to today's standards,

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Question:

There was a time when workers were considered expendable. Before the evolution of HR to today's standards, working conditions were harsh and dangerous. Also the tension between the need for physical protection and higher output was growing. Now when the modern work in conditions are not terrible as the medieval period, explain about the evolution mechanism. Discuss in detail about how the role of HR department paved way for better working conditions?