Final answer:
Metastasis is the term for the movement of malignant cells from their site of origin to distant tissues and organs. It occurs when cancer cells enter the bloodstream and form new tumors in different locations in the body.
Step-by-step explanation:
The term for the movement of malignant cells from their site of origin to distant tissues and organs is metastasis. Metastasis occurs when cancer cells break away from the primary tumor and enter the bloodstream, allowing them to travel to other parts of the body and form new tumors in different locations. This process is responsible for the spread of cancer throughout the body.