Fact 1: Mutation creates new genetic variation in a gene pool.

Fact 2: Mutations Mutations are caused by random changes in genes.

Given the two facts above, answer the question "What creates new genetic variation in the gene pool?" with the following options: 
- The bending of a ray of light
 - passenger pigeons
 - peachleaf willow
 - Warm air moving into cold air
 - random changes in genes
 - that material's properties
 - a tree falling
 - By wind and rain


 

     random changes in genes    