Final answer:
A tumor that is cancerous is called a malignant tumor. Malignant tumors can grow beyond their boundaries and can enter the bloodstream to form new tumors in other parts of the body.
Step-by-step explanation:
A tumor that is cancerous is called a (n) malignant tumor. Malignant tumors are cancerous and can grow beyond the boundaries of the tumor itself.
They can also shed tumor cells that enter the bloodstream and travel to other parts of the body, a process called metastasis, which can result in the formation of new tumors. On the other hand, benign tumors are harmless and do not invade other tissues or form metastases.