Answer: hematopoiesis
Explanation:
The human body's blood stem cells produce approximately 10 billion new white blood cells – termed immune cells – every day. In the process of blood production, each blood stem cell passes its unique genetic label onto its progeny – which include two types of immune cells, known as B cells and T cells.The development of all cells of the immune system begins in the bone marrow with a hematopoietic (blood-forming) stem cell (Figure 2). This cell is called a “stem” cell because all the other specialized cells arise from it.
