You are presented with the question "What can be reduced when a population suddenly gets much smaller?" and the following answer choices: 
- Pollution
 - The size of the Earth
 - Greenhouse gasses
 - The size of bottlenecks
 - The size of the environment
 - Genetic variation
 - Plant growth is reduced
 - Quality of life

Now knowing that bottleneck effect occurs when a population suddenly gets much smaller and genetic variation can be reduced by random genetic drift, population bottlenecks, founder effect, choose the best answer.


 

      Genetic variation   