Answer: Organ systems:
 they work together to carry out a particular function for the organism.
Explanation:
 
        
             
        
        
        
DNA replication is semiconservative in the sense that is uses one old strand to create a new strand.
Thus, it conserves a strand to create a new item in a sense.
Hope this helps!
        
             
        
        
        
the answer you put is right
 
        
                    
             
        
        
        
Answer:
A. Increasing the food supply 
 
        
             
        
        
        
Answer:
it depends on changes in gene expression