Mr. Smith has found a lump under his arm. He goes to his doctor, and the doctor confirms that the lump is cancer. How are cancerous cells different from normal cells?
A.
cancer cells occur in adults but not in children
B.
the growth-regulating genes of cancer cells have mutated
C.
cancer cells are found in the lymph; normal cells are not
D.
carcinogens change cancer cells to normal cells