A, I’m pretty sure, Meiosis helps with genetic diversity
        
                    
             
        
        
        
<span>cartilaginous Is the word you can use to fill in the blank!</span>
        
                    
             
        
        
        
Answer:
C. Population shrinks; 15 birds in  the end
Explanation:
Let us understand some of the given terms; 
   immigration is a form of migration in which organisms comes into a territory. 
   emigration is a form of migration in which organisms leaves a place
  population is a group of organisms of the same species
Given: 
Population  = 21 birds
Immigrant = 3 birds
Emigrants  = 9 birds
  Population change = total number of birds + immigrant  - emigrants
                                    = 21 + 3 - 9 
                                      = 15 birds
The population will shrink giving 15 birds in the end
 
        
             
        
        
        
Assuming you mean living matter
All living matter is produced by other living matter