Protection, sensory perception, storage, absorption, sunscreen, dilation, and constriction
        
                    
             
        
        
        
<span>D) tightly packed electrons</span>
        
                    
             
        
        
        
<span>Sustainable use means the use of components of biological diversity in a way and at a rate that does not lead to the long-term decline of biological diversity, thereby maintaining its potential to meet the needs and aspirations of present and future generations.</span>Oct 16, 2014.
Hope it helps