Question

choose all that are primary lymphatic organs.

spleen
tonsils
thymus
red bone marrow
lymph nodes

Explanation:

Primary lymphatic organs are where lymphocytes are formed and mature. The thymus is where T - lymphocytes mature, and red bone marrow is where B - lymphocytes mature and all blood cells (including lymphocytes) are formed. The spleen, tonsils, and lymph nodes are secondary lymphatic organs that filter lymph or blood and are sites of immune response.

Answer:

Thymus, Red bone marrow