A. nucleus because it is in the center of the cell and it’s the core of the cell
 
        
                    
             
        
        
        
Answer:
An individual organism that supplies living tissue to be used in another body, as a person who furnished blood for transfusion or an organ for transplantation in a histocompatible recipient that doesnt function.
Explanation:
 
        
             
        
        
        
The habitat with equal numbers of all the different species will have the higher diversity.