Fact 1: Gene flow occurs when individuals move into or out of a population.

Fact 2: Genetic diversity can be maintained in small populations by even a small amount of gene flow.

Given the two facts above, answer the question "What can be maintained when individuals move into or out of a population?" with the following options: 
- loose soil
 - vegetation
 - reusing materials
 - important habitats
 - genetic diversity
 - resistance
 - hydration
 - swamp vegetation


 

     genetic diversity    