Final answer:
Leukemia is a type of cancer that affects blood cells. Acute leukemia progresses rapidly and can be fatal if left untreated, while chronic leukemia develops more slowly. Both types of leukemia can be treated with chemotherapy and radiation therapy.
Step-by-step explanation:
Leukemia is a type of cancer that affects blood cells. There are two main types of leukemia: acute leukemia and chronic leukemia. Acute leukemia appears suddenly, progresses rapidly, and can cause death within a few months if it is not treated. It is characterized by the overproduction of young, immature leukocytes. On the other hand, chronic leukemia develops more slowly and may go undetected for many months. In chronic leukemia, mature leukocytes accumulate and fail to die. Both types of leukemia can be treated with various treatment options, including chemotherapy and radiation therapy.