Answer: to fight against foreign antigens 
Explanation: lymphocytes is a type of white blood cell that helps fight against invaders or foreign body in our body system. They are found mostly on the lymph and blood
There are basically two types of lymphocytes;
T lymphocytes- It develops from the thymus and Its functions by identifying intruders and then respond by eliminating them. 
B cell or lymphocytes develop from the bone marrow hence the name B cell. It functions by creating some antibodies that destroy the effect of invaders that causes adverse effect. 
 
        
                    
             
        
        
        
Answer:
D.  atomic mass unit
Explanation:
The atomic mass unit is used for measuring atomic mass.
 
        
                    
             
        
        
        
The inheritance of a dominant gene E results in the free out unattached earlobe. If the lobe is attached directly to the head, the individual is homozygous recessive, and the rest genotype is present. Hope this helps.
        
             
        
        
        
According to erikson, development is best reflected in  resolution of psycho-social tasks. <span>Erikson’s psychosocial theory of development considers the impact of external factors, parents and society on personality development from childhood to adulthood. According to Erikson’s theory, every person must pass through a series of eight interrelated stages over the entire life cycle</span>