Answer:
The answer revolves around the system of checks and balances. These are known as reserved powers. Each city government is a microcosm of a larger government. It is complex because our Founding Fathers knew that the federal government would fail at state and local levels. Each city has its own problems and its own identity. In my opinion, it does serve the people. 
Explanation:
 
        
             
        
        
        
Answer:
Water
Explanation:
scientists have study how water has caused erosion which was the case in the forming of the Grand Canyon.
 
        
                    
             
        
        
        
Answer:
B - Social Facilitation
Explanation:
Social Facilitation is the phonomenon where people perform better when in a group setting (whether in a group or just being observed)
 
        
             
        
        
        
Answer and Explanation:
The change in the digital structure is an effect of the modernization and evolution of society, which seeks to facilitate the processes to which the human being is related, making them more dynamic, democratic and quick. In social life, these changes allow greater communication between individuals, which can reinforce socialization and decrease contact problems. In the economic sector, changes in the digital structure can optimize the projects and elements that make up the economic fields, promoting faster and more efficient work.