Topoisomerase is the enzyme that can be added to correct the untwisting that is led to strain ahead of the replication fork. 
        
                    
             
        
        
        
Answer:
An iron rod used for beating down the earthy substance in tamping for blasting.
 
        
             
        
        
        
Answer:
Abiotic
Explanation: Water is not a living thing, therefore water is an abiotic factor.
 
        
             
        
        
        
Starfish have a unique form of digestion in the animal kingdom and a water-vascular system that allows the animal to breathe.
All your answers should be in this article: 
http://animals.mom.me/feeding-respiration-starfish-6596.html
 
        
             
        
        
        
Answer:
The Pacific Plate is colliding with the Australian Plate at a rate of about 40 mm/yr. The East coast of the North Island is being compressed and lifted by this collision, producing the North Island and Marlborough Fault Systems.
Explanation: