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

Fact 2: Cell division is by mitosis .

Given the two facts above, answer the question "aging occurs because of a loss of what?" with the following options: 
- wrinkles
 - the skin
 - mitosis
 - glucose
 - eyesight
 - density
 - Energy
 - alleles


 

   mitosis      