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

Fact 2: People are individuals, and each person has different needs.

Given the two facts above, answer the question "What happens when people flow into or out of a population?" with the following options: 
- genetic morphing
 - death
 - gene flow
 - movement
 - generic flow
 - interact
 - competition
 - gene expression


 

   gene flow      