Answer:
The changes which can be reversed are called reversible changes. These are also called physical changes. Example- Melting of ice, Tearing of paper etc are physical or reversible changes. 
Explanation:
 
        
             
        
        
        
I believe that on the Naive B-cell the antibodies exist as transmembrane proteins. A naive b-cell is a type of b-cell that has not been exposed to an antigen. When exposed it becomes either a memory B cell or a plasma cell that secrete antibodies  specific to  the antigen that was originally bound. 
        
             
        
        
        
Answer: absorption
Explanation: “The process or action by which one thing absorbs or is absorbed by another.”
In this case, matter and energy is absorbed.
        
             
        
        
        
Answer:
Protein is also used for growth and repair. Amid all these necessary functions, proteins also hold the potential to serve as a metabolic fuel source. Proteins are not stored for later use, so excess proteins must be converted into glucose or triglycerides, and used to supply energy or build energy reserves.
 
        
             
        
        
        
B. Increased exposure to UV light increases the risk of mutation occurring.