Answer:I think that answer is b 
Explanation:
 
        
             
        
        
        
1). it either lowers or increases the activation energy. 2). it modifies the rate of the reaction
        
             
        
        
        
Answer:
The nitrogenous bases in DNA are adenine (A), guanine (G), thymine (T), and cytosine (C).
Explanation:
 
        
                    
             
        
        
        
Answer:
How Does the Immune System Work?
Innate immunity: Everyone is born with innate (or natural) immunity, a type of general protection. ... 
Adaptive immunity: Adaptive (or active) immunity develops throughout our lives. ... 
Passive immunity: Passive immunity is "borrowed" from another source and it lasts for a short time.
 
        
             
        
        
        
Answer:
express different genes
Explanation:
cells of a multicellular organism have the same genes with the same chromosomes
however their expression varies from cell to cell depending on their function