Answer:
the bodily system that protects the body from foreign substances, cells, and tissues by producing the immune response and that includes especially the thymus, spleen, lymph nodes, special deposits of lymphoid tissue (as in the gastrointestinal tract and bone marrow), macrophages, lymphocytes including the B cells and T cells, and antibodies
Explanation:
This is the definition of the phrase "Immune System". This should help you however if you need a more exact answer then I would suggest searching it up.
