Answer:
because by overfishing we can destabilize the oceanic environment
 
        
             
        
        
        
Answer:
Heterotroph. Autotrophs are organisms that can produce their own food from the substances available in their surroundings using light (photosynthesis) or chemical energy (chemosynthesis). Heterotrophs cannot synthesize their own food and rely on other organisms — both plants and animals — for nutrition.
Explanation:
Heterotroph. Autotrophs are organisms that can produce their own food from the substances available in their surroundings using light (photosynthesis) or chemical energy (chemosynthesis). Heterotrophs cannot synthesize their own food and rely on other organisms — both plants and animals — for nutrition.
 
        
                    
             
        
        
        
The answer is B . 
Biotic factor refers to living things .
        
                    
             
        
        
        
In order to study the formation of cancer cells, you should study the life cycle of normal cells as cancer cells are abnormal cells. 
Actually, Normal cells grow, divides and died after an interval of time. And when this process is break down, cancer cells begin to form. They are usually old cells which don't die after their life cycle.
Hope this helps!