Clenching the fingers to make a fist, then relaxing and straightening them is an example of :Flexion followed by extension
To put it simply, joint will become shorter during flexion and will become longer during extension. When he made a fist, he curled ul the joints in his hand, and when straightening the arm, he elongate the joint on his elbow
        
             
        
        
        
Answer: National Crime Information Center (NCIC)
Explanation: The national crime information center is the United States' central database for tracking crime-related information. Established in the year 1967 the purpose of the system was to create a centralized information system to facilitate information flow between the numerous law enforcement branches. 
 
        
             
        
        
        
I believe the answer is: Relationship building
understanding similarities and differences  serve two important functions in relationship building. The first one is to create a sense of tolerance between different group of people. The second one is to help them achieve tolerable compromise during negotiation rather than conflict.
 
        
             
        
        
        
Answer:
sustainable agricultural, environment, and natural resource 
Explanation: