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

Fact 2: Cell damage also occurs during ageing.

Given the two facts above, answer the question "cells can be damaged when they lose their ability to what" with the following options: 
- divide
 - retina
 - produce air
 - grow
 - produce enzymes
 - alveoli
 - stay warm
 - breathe


 

 divide        