Its constructive force.
hope this helps you
        
             
        
        
        
Genetic testing can also be used to determine biological relatives, such as a child's biological parentage (genetic mother and father) through DNA paternity testing, or be used to broadly predict an individual's ancestry.
 
        
             
        
        
        
It's true because higher the resistence, the less of current will go through, bringing it lower.
        
                    
             
        
        
        
Give nutrients and protein which helps you to get energy and strengh