Fact 1: Aging occurs as cells lose their ability to divide.

Fact 2: Cells produce more cells by dividing into two cells.

Given the two facts above, answer the question "What causes less cells to be produced " with the following options: 
- Aging
 - loss
 - Oxygen
 - Nutrition
 - drought
 - fat
 - Sunlight
 - coal


 

 Aging        