Mitochondria is the powerhouse of the cell. Only thing I remember from middle school science
        
             
        
        
        
Breaks down over time and becomes dirt
        
             
        
        
        
Chemical energy into  kinetic energy
        
                    
             
        
        
        
Clear-cutting is the most common method of timber removal. Clear-cutting removes all the trees in a given area, often by using large machinery. From an economic standpoint, the benefit of this approach is that humans can harvest maximum timber with minimal energy and cost.