The best way to prevent cholera is to promote healthy sanitation practices and to filter and treat drinking water sources.  Cholera bacterium is usually found in water or food sources that have been contaminated by feces from infected person with cholera. It is mostly found and spread in places with inadequate water treatment, poor sanitation, and inadequate hygiene.
        
                    
             
        
        
        

velocity is a vector so it has a magnitude and direction so the answer would be B
 
        
                    
             
        
        
        
Is there a picture that goes with this or a question?
        
             
        
        
        
 Answer:
D. The nerves exit the central nervous system in the head and from the lumbar spine.
Explanation:
The preganglionic neurons transmit the nerve impulses through the cranial or spinal nerves that arise from the brain, to the postganglionic neurons from where the nerve fibers that relay these nerve signals to the different viscera and effector organs, located along the spinal cord