Primary succession occurs in essentially lifeless areas while secondary succession happens where there were previous communities
        
             
        
        
        
Answer:
The synthesis of energy using light.
Explanation:
Plants and photosynthetic organisms use this method instead of eating food.
Chlorophyll needed for this reaction is also a green pigment. 
 
        
                    
             
        
        
        
The deeper down you get, the colder the water is