Cancer cells divide more often than normal cells, and grow out of control.
Cancer is an example of a mutation in cells.
Mutated cells divide more often than normal cells, and grow out of control.
What divide more often than normal cells, and grow out of control?

a: white blood cells
b: Most plants
c: hair cells
d: skin cells
e: Smoking
f: peachleaf willow
g: mutated cells
h: cigarettes