A is correct because there is no reaction involved
        
                    
             
        
        
        
Answer: what would swimming in mathane lake on titan feel like. 
Explanation:
 
        
             
        
        
        
Answer:
Antigens are molecules capable of stimulating an immune response. Each antigen has distinct surface features, or epitopes, resulting in specific responses. Antibodies (immunoglobins) are Y-shaped proteins produced by B cells of the immune system in response to exposure to antigens.
 
        
             
        
        
        
The scientific method is defined as a method of research in which a problem is identified, relevant data is gathered, a hypothesis is formulated from this data, and the hypothesis is empirically tested.