The answer would be C, it would be more difficult for DNA to unzip. Hydrogen bonds are strong, but easy to separate. 
        
                    
             
        
        
        
Answer:
competition 
Explanation:
I'm not sure if this is the answer you are looking for or not but it sounds like it could be competition 
 
        
             
        
        
        
The correct answer is tidal energy needed for life.<span> It is a well-known fact that the Moon affects the waters on Earth in such a way that it creates disruptions in the oceanic and sea levels and thus larger or smaller tides are created. These tides are necessary for hydropower, among other things, so it is only natural that the Moon should have such an important impact on life on Earth.</span>
        
                    
             
        
        
        
Answer:
Atoms are made up of particles called protons, neutrons, and electrons, which are ... Within the main group elements ( Groups 1-2, 13-18), there are some general ... (via loss of electrons), the ion is positively charged and is called a cation.
Explanation: