A doctor need to study chemistry: To know and understand the chemicals processes of matter in the body work which is for example insulin, DNA etc. and to study of all processes in a living organism. The three reasons to study chemistry is because chemistry can be useful in clearing up the natural world, preparing people for career opportunities and producing informed citizens. Some outcomes of modern research in chemistry can lead to technologies that aim to benefit the environment, preserve and produce energy, progress human life and multiply our knowledge of the universe. To help the citizen be a more informed citizen is to let them know how things work makes better decisions and use them better 
        
             
        
        
        
I am inclined to say 1. core and mantle... but im not entirely sure...
sorry not much help at all!
        
             
        
        
        
Well either he is cold or he has a lot of negative energy in him to where it makes him staticky
        
                    
             
        
        
        
We rely on Meiosis so that we can produce/have genetic diversity. It also enables us to have proper conditions for reproductive success.