Here's why:

* Hematopoiesis is the process of creating new blood cells, including red blood cells, white blood cells, and platelets.

* The lymphatic system is a critical part of the immune system, responsible for filtering lymph fluid, transporting immune cells, and playing a role in the production of lymphocytes (a type of white blood cell).

* Bone marrow is the primary site of hematopoiesis, and it's considered part of the lymphatic system.

While the lymphatic system is the overall system responsible for hematopoiesis, it's important to note that bone marrow is the specific tissue where the process occurs.