Killing a lot of people and causing the 9/11 attacks
        
                    
             
        
        
        
In a population pyramid, the size of the population under investigation is depicted on the horizontal axis, and age is aligned on the vertical axis. The result is a series of bars stacked on top of one another, each representing an age category (typically in 5-year age groups), with the youngest age group represented by the bottom bar and the oldest age group by the uppermost bar. The horizontal length of each bar represents the number of individuals in the specific age group for the population depicted.
        
             
        
        
        
Answer: social control
Explanation: The existence of social norms, both formal and informal, is one of the main things that inform social control; also known as a way to encourage social conformity. 
It is defined simply as a way society tries to prevent and sanction behaviours that violates existential rules that is enforced by members of a community. 
Such ways might include for instance, shame, ridicule, sarcasm, criticism and disapproval.
 
        
             
        
        
        
The answer to your first question is TRUE its part of the check and balance system.