Final answer:
Malignant tumors that spread to other parts of the body are known as metastases. Metastasis occurs when cancer cells break away from the primary tumor and enter the bloodstream, allowing them to form new tumors in different tissues.
Step-by-step explanation:
Malignant tumors that spread to other parts of the body are known as metastases. Metastasis occurs when cancer cells break away from the primary tumor and enter the bloodstream, allowing them to travel and form new tumors in different tissues. Common sites for metastases include the brain, lungs, bones, and liver. This phenomenon is associated with more advanced stages of cancer and is often difficult to treat or control.