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

Fact 2: Portions of the telomeres are lost each time a cell divides.

Given the two facts above, answer the question "The loss in length of what causes cells to age?" with the following options: 
- fur and fat
 - layers of fat
 - cell membrane
 - sunlight
 - Chlorophyll
 - telomeres
 - programmed cell death
 - cancer


 

      telomeres   