C. No one knew germs existed 
Therefore diseases spread because they did not know how to prevent them and they did not have good hygiene.
        
             
        
        
        
C. Delivers more oxygen to the body
        
                    
             
        
        
        
If it's credible it usually will cite where it got it's information to avoid copyright bs
        
             
        
        
        
Its to make plant food, or photosynthesis
        
             
        
        
        
Don't take the aggressive actions of other drivers personally.