I believe it’s c for warm front then f for cold front. I hope that helps!
        
             
        
        
        
Answer:
true 
Explanation:
energy is the energy to do things 
and there is a force in our bodies wich is giving out energy through a distance 
 
        
             
        
        
        
Gases and plasma's undergo changes in volume most easily<span>. In contrast, liquids and solids have fixed volumes, although liquids do not have fixed shapes. Gases and plasma's expand or contract to fill their containers.</span><span />