Fact 1: Aging is associated with the death of cells.

Fact 2: When telomeres become too short, the cell dies.

Given the two facts above, answer the question "What is associated with aging?" with the following options: 
- Extra cells
 - intelligence
 - forest is destroyed
 - Chemical energy
 - Strong cells
 - oxidation reaction
 - Short telomeres
 - massive damage


 

       Short telomeres  