Final answer:
The primary site of hemopoiesis in adult humans is in the red bone marrow.
Step-by-step explanation:
The primary site of hemopoiesis in adult humans is in the red bone marrow. Hemopoiesis is the process of blood cell production, which occurs in the red marrow found inside some bones, including the pelvis, ribs, and vertebrae. The red bone marrow synthesizes red blood cells, white blood cells, and platelets.