Answer:
Han?
Explanation:
If by civilizations you mean ethnic groups it would be the Han. 
 
        
             
        
        
        
Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy. ... The binding of a substrate to an enzyme active site is termed the "enzyme-substrate complex.
        
             
        
        
        
Answer:
Each word matched to its description below. (DISCLAIMER: I am not sure if it is correct. Sorry if it's wrong!!) 
Explanation:
Urbanism: A social emphasis on life in densley poulated areas
Urbanization: An increasingly city-focused world with more and more cities 
Metropolitan Area: A territory that spreads outward from the main city center to include suburbs and the surrounding towns.
Industrialization: The development of manufacturing and other industry in a society or country. 
 
        
             
        
        
        
Until recently, Sudan and South Sudan were a unified country. Africa is mainly known for its diversity of wildlife, but there is more to be known about this continent than its wildlife. There are certain political issues in some parts of the continent that require the world’s attention. Sudan and South Sudan are such parts of the continent which one should understand.
 
        
             
        
        
        
In such cases, the person who wants to change it has to show a receipt of the purchase. If the person does not have a receipt and still persists you can call the manager and the manager can solve it. If the manager is not there, you can say that there's nothing that you can do and that the person can return at a later time when the manager might be there. You can also point them to your customer service.