Answer:
The correct option is D) M and N
Explanation:
The structure M is identified as Thymus and the structure N represents spleen.
Thymus can simply be described as the primary organ of the lymphatic system. It is the site where the development and maturation of T cells takes place which plays an active role in generating adaptive immunity.
Spleen is the major organ of the lymphoid system. It is the site where many lymphatic cells arise and become mature.
