what are the function of the thymus and the spleen in maturation of lymphocytes, 2. how does the lymphoid organs' structure enables their unique...

1.    what are the function of the thymus and the spleen in maturation of lymphocytes, 2.     how does the lymphoid organs' structure enables their unique function3.    what are the functional aspects of T and B cells in terms of origin, quantities in blood and bone marrow, membrane receptors and surface markers.