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

Fact 2: Influenza viruses mutate.

Given the two facts above, answer the question "What can achieve new genetic variation in its gene pool?" with the following options: 
- competition
 - Most plants
 - rocks
 - A computer
 - influenza viruses
 - nothing
 - peachleaf willow
 - dust


 

     influenza viruses    