RNA has great capability as a genetic molecule; it once had to carry on hereditary processes on its own. It now seems certain that RNA was the first molecule of heredity, so it evolved all the essential methods for storing and expressing genetic information before DNA came onto the scene.
        
                    
             
        
        
        
We can’t see the picture :(
Maybe post another question but with the picture
        
                    
             
        
        
        
The quicker the regulation, the less energy and material wasted to unneeded products and pathways.
        
                    
             
        
        
        
Wet magma causes explosive volcanoes