Why did it take almost 100 years after its initial discovery in 1921 to conclude DNA study of harappan sites?

  • December 1, 2020
  • Posted by: OptimizeIAS Team
  • Category: Mains
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OPTIMA (Mains) 2020 Why did it take almost 100 years after its initial discovery in 1921 to conclude DNA study of harappan sites?