Question

Question 4

A drawing sheet changes when you draw a picture on it. Can you reverse this change?

Answer 1

It is all depends on situations:
- By erasing the drawing we can undo the change. For example, if we draw with the help of pencil, we can erase the drawing by using an eraser. Then, it is a reversible change.
- If we draw using a pen, we cannot erase the drawing. Then this change cannot be reversed, so it is an irreversible change