Primary lymphoid tissues are the sites where lymphocytes develop and mature whereas secondary lymphoid tissues are the sites where lymphocytes are stimulated.
<h3>What are lymphoid tissues?</h3>
Lymphoid tissues are tissue which form part of the lymphatic system of the body.
The lymphatic system is the system of the body which is concerned with the production of the immune cells and in which the lymph circulates.
The primary lymphoid tissues are the bone marrow and thymus where there lymphocyte develop and mature.
The secondary lymphoid tissue include the lymph nodes, spleen, tonsils and Peyer's patches and are the sites where lymphocytes are stimulated.
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Note that the complete question is given as:
Primary lymphoid tissues are the sites where lymphocytes ____, whereas secondary lymphoid tissues are the sites where lymphocytes ____.
a. are stimulated; develop and mature
b. encounter pathogens; undergo apoptosis
c. develop and mature; become stimulated
d. undergo clonal selection; differentiate from hematopoietic stem cells
e. die; are phagocytosed after death
