Final answer:
Leukemia is a form of cancer that attacks the blood. It is characterized by an abnormal production of blood cells, usually white blood cells.
Step-by-step explanation:
Leukemia is a form of cancer that attacks the blood. It is characterized by an abnormal production of blood cells, usually white blood cells. Leukemia affects the production and function of blood cells, leading to symptoms such as fatigue, frequent infections, and easy bruising or bleeding.