You are presented with the question "What tends to occur when individuals move in and out of a population?" and the following answer choices: 
- By wind and rain
 - permineralization
 - The bending of a ray of light
 - Something with a head, thorax, and abdomen
 - a decrease in differentiation
 - competing for resources
 - barks and snarls
 - metabolic reaction

Now knowing that gene flow occurs when individuals move into or out of a population and gene flow tends to decrease differentiation, choose the best answer.


 

     a decrease in differentiation    