B migration, that is the answer
        
             
        
        
        
Answer:
round worms reproduce sexually 
the nervous system of a roundworm contains a brain and nerve cords
 
        
                    
             
        
        
        
Antibodies are produced when the body is exposed to antigens.
During an initial encounter with a foreign antigen, the body's immune system namely the adaptive arm of the immune system, produces memory cells, a group of special lymphocytes that retain and store memory of the antigen.
On a second encounter with the same kind of antigen, the immune system "remembers" the antigen and mounts a rapid, specific and vigorous immune response against the antigen. This response includes the production of massive amounts of antibodies very specific to the antigen. 
The antibodies effectively neutralize the antigen and facilitate its destruction. 
 
        
                    
             
        
        
        
Answer:
Identify all the entities in the system. An entity should appear only once in a particular diagram. ...
Identify relationships between entities. Connect them using a line and add a diamond in the middle describing the relationship.
Add attributes for entities.
Explanation: