Fact 1: Cancer is a disease that occurs when the cell cycle is no longer regulated.

Fact 2: Cancer is a defect in regulation of the cell cycle.

Given the two facts above, answer the question "cancer is a defect that occurs when there is no longer regulation of what?" with the following options: 
- injections
 - breathing
 - disease
 - cycles
 - glucose
 - the skin
 - Energy
 - attitude


 

    cycles     