History Ch - 1 Introduction: Tracing Changes Through a Thousand Years — Social Studies STD 7 — Question

There are several difficulties historian face in using manuscripts such as 
→ Manuscripts were handwritten and palm leaves were used in early days. It was difficult to maintain them. 
→ There was no printing press in those days. So people copied manuscripts by hand. They were known as scribes. Different handwriting made the reading of manuscripts hard. 
→ Sometimes scribes introduced small changes in the original manuscript by mistake. This made the copied manuscripts very different from the original ones.