D should be the answer as they are no longer able to perform sexual reproduction without the other fish. Therefore, they would die off because they have lost the partner needed to reproduce.
Hope this helps!
        
                    
             
        
        
        
Answer:
Explanation:The investigation is aimed at understanding
1. how molecular size affects movement through a membrane.
Therefore
2.Add more of the proteins to the plasma membrane.
 Then measure the rate of the particle movement
 
        
                    
             
        
        
        
The answer to your question is D