-What are the specific linkages among immune surveillance, clonal selection, and lymph nodes? Solution Role of immune system is to protect body from invaded pathogen. Immune system indentifies the invaded foreign particle and pathogens. But this not only the thing the immune system performs. Immune systems monitoring the internal body cell/host cells which are able to convert in pathogenic form. After identification of such cells, the immune system eliminates them rapidly. So such cell gets destroyed before they get matured. Immune system destroys such cells as fast as they grow. Second one isclonal selectionin which the immune system defined function of lymphocytes. This role is assigned as per the type of antigen enter inside the body. Immune system use this term to define the type of antigen. Against those antigens they will release particular antibody/macrophages/lymphocyte. Lymph node is also the part of the immune system. In which it filter the cells which identify the pathogen and fight against them. Lymph node includes the two types of cell i.e. B cells and T cells. They produce the antibodies against the antigen. All these three are linked as per immunity system. These all terms take part in establishing the immune system to protect from invaded pathogen..