Which best describes cancer cells?
cancer cells cannot enter the circulatory system.
cancer cells grow controllably.
cancer cells attach to organs.
cancer cells lose nutrients to healthy cells.

The correct answer is- Cancer cells attach to organs.

Explanation:

Cancer cells are the cells that are immortal and can grow uncontrollably. The cancer cells can spread from one organ to another and this property is called metastasis and this is the property of malignant tumor.

This malignant tumor cell or cancerous cell has the ability to attach the new tissue or organs and grow there. This property allow them to spread the cancer in the body. So these cells can produce secondary tumors by attaching to new organs.  

The circulatory system and lymphatic system plays an important role in transferring the cancer cells to other distant organs. So the right answer is- Cancer cells attach to organs.