Final answer:
The spleen is the lymphatic organ known for removing aged defective red blood cells.
Step-by-step explanation:
The lymphatic organ known for removing aged defective red blood cells is the spleen.
The spleen is a secondary lymphoid organ that filters pathogens from the blood and removes degenerating or damaged blood cells.
For example, macrophages in the spleen phagocytize old and damaged red blood cells, playing a crucial role in their removal.