Final answer:
The bone marrow and intestinal tissue have rapidly dividing cells and are susceptible to radiation, which is why they are targets in cancer treatments.
Step-by-step explanation:
Two organs in the body with rapidly dividing cells are the bone marrow and the intestinal tissue. The bone marrow is crucial for producing new blood cells, while the intestinal tissue continually regenerates to maintain the lining of the gastrointestinal tract. These tissues are susceptible to damage from radiation due to the high rate of cell division. For instance, therapies targeted at treating cancer utilize radiation to destroy cancer cells, which divide more rapidly than normal cells.