Why did China improve the world’s first paper currency? Please write in complete sentences with a detailed explanation. Thanks! :D

To avoid having to carry thousands of strings of coins long distances,

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.

islam spread slowly through much of africa through trade and preaching.