D. It allows a variety of substances to dissolve in and around cells.
Explanation:
The shell of hydration is important to life because it allows a broad range of substances to dissolve in and around the cells. 
- The shell of hydration allow for water to dissolve a wide range of substances and disperse them uniformly in it. 
- Water serves a solvent capable of dissolving a wide range of substances because it forms a hydration shell round them. 
- This allow for materials to be in solution around the cell. 
- Diffusion and osmosis can readily now take place. 
Learn more: 
Hydration energy brainly.com/question/2868767
#learnwithBrainly
 
        
             
        
        
        
UV rays reacting with the O2 molecules
I might be wrong a little but 
Hope the helps :)
 
        
                    
             
        
        
        
Answer:
no problem
Explanation:
but you should probably ask any questions that you have in order to get help