In the open ocean, especially around the surface, one of the main sources of food for fish would be the algae that grow at the surface & photosynthesize with the sun. Without fish to regulate the amount of surface algae, they overgrow and block the sun from the organisms on the coral reef. 
Without sun, the reef is not able to sustain themselves & it's down hill from there. 
I hope this helps!
        
             
        
        
        
In the two-stage cooling method, time allowed to cool food from 135 degrees F or more to 70 degrees F or less can be four to six hours.
        
             
        
        
        
Answer:
all species were derived from ancestral group 
 
        
                    
             
        
        
        
Answer:
B) Additional studies will be the reliability check for the claims.