Answer:
i think is Destruction of coral 
 
        
                    
             
        
        
        
D.  A variable or alteration to one part that affects an entire system
Explanation:
When talking about natural and physical systems, change is a variable or alteration to one part that affects an entire system. 
Systems are groups of processes that have the same overall function. There are several types of interacting components that makes up both physical and natural systems in our world.
- The part of  system is related and interconnected via the changes they undergo. 
- Changes typically causes variation or alteration of parts of a system. 
learn more: 
Biogeochemical cycle brainly.com/question/3509510
#learnwithBrainly
 
        
             
        
        
        
Stored energy. Also this should have been listed under physics lol
        
             
        
        
        
C:Regulate the emotions of a man. Remember this by thinking of a male dog when he grabs something he growels because of testosterone