Fact 1: Cell division often causes growth.

Fact 2: Mitosis is cell division.

Given the two facts above, answer the question "What often causes growth?" with the following options: 
- exercise
 - hormones
 - Atrophy
 - collagen
 - Earthworms
 - Apoptosis
 - Necrosis
 - Mitosis


 

        Mitosis 