Answer:
using multiple origins of replication on each chromosome
Explanation:
 
        
             
        
        
        
The DNA is splitting in two, thymine pairs with adenine, and guanine pairs with cytosine
 
        
             
        
        
        
The three substances that cause a double displacement reaction to occur are:
(i)   Ionized compounds. These are usually water.
(ii)   A gas that bubbles out a solution.
(iii)  A precipitate.
In double displacement reaction is where two new compounds are formed when two parts of two compounds switch places. For example; when sodium chloride combines with silver nitrate, the two new compounds formed are Sodium nitrate and silver chloride reason being sodium and silver switched places.
        
             
        
        
        
Answer:
I can only see the very first one and it only needs a rotation. Can you add pics of the others. 
Explanation: