The primary benefit of folic acid is that it helps in preventing neural tube defects. Folic acid also known as Vitamin B9 are used as a supplementary vitamins taaken by many pregnant mother in order to develop the baby without deformities. Lacking of Folic acid causes neural tube defects define as an irregularities of the brain and spinal cord during the first week of prenancy
        
             
        
        
        
Probably because a lot of them where fans of his.
 
        
                    
             
        
        
        
For number 8:
all radio waves,
infrared radiation,
visible light,
ultraviolet radiation,
X-rays,
gamma rays.
        
                    
             
        
        
        
True.
The earth is made of several subsystems or spheres that interact to form a complex and continuously changing (dynamic) state that is termed as the earth system.
Even though the earth system is a closed system, it self regulates through the subsystems  such as the water cycle and  carbon cycle. 
The earth system is characterized by numerous overlapping cycles in which matter is recycled  over and over again. Cycles involve multiple spheres and systems interactions. Humans impact and are impacted by the cycles in various ways.
 
        
             
        
        
        
The answer will be haptens because haptens has the ability of combining to carriers that are large enough to produce antibodies. The large carriers are usually the proteins that binds to it after producing antibodies. The antibodies, ions and reagins does not comply in the question above for antibodies focus more in the immunization. The ions are the electrons that produce positive or negative electric charge and the reagins are the ones responsible in allergic reactions.