Enslaved people from Africa were being traded for raw materials.
Economists are the social scientists that focus their studies on scarcity, resources and profit motives. The economists not only follow the pattern in which the economy of a country is going, it also gives plans to improve the economy. They are a very important part of any civilized society. I hope it helps you.
C
expanding the Chinese empire by conquering other lands
The answer is b
Hope I helped
Canals are man-made, meaning, they are Human Systems.
Faults are natural, meaning, they are <span>Physical Systems.
Floods are not created by man, meaning, they are </span>Physical Systems.
Bridges are man-made, meaning, they are Human Systems.
I hope this helps!