Answer:
<u><em>B) Adding more plants</em></u>
Explanation:
Live plants produce oxygen and absorb carbon dioxide and ammonia in the water that fish generate
 
        
                    
             
        
        
        
embryonic stem cells could serve as a model to evaluate the physiological effects of environmental pollutants efficiently and cost-effectively.
 
        
                    
             
        
        
        
Answer:
i am sorry i dont know  :(
Explanation:
 
        
             
        
        
        
The answer to this is true