Question

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the major types of lymphocytes are cells and cells, both of which are important in immunity.
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Explanation:

Lymphocytes are a type of white - blood cell important in the immune system. The two major types are T - lymphocytes (T - cells) and B - lymphocytes (B - cells). T - cells are involved in cell - mediated immunity and B - cells produce antibodies for humoral immunity.

Answer:

T; B