According to modern science, Earth is about 4.5 billion years old and written human history extends back about 10,000 years. Suppose the entire history of Earth is represented with a 10-meter-long timeline, with the birth of Earth on one end and today at the other end. a. What distance represents 3 billion years? b. How far from the end of the timeline does written human history begin? www I b. Written human history begins about millimeters from the end of the timeline (Type an integer or decimal rounded to the nearest hundredth as needed.)