Fact 1: Bottleneck effect occurs when a population suddenly gets much smaller.

Fact 2: Population is the number of people.

Given the two facts above, answer the question "What is it called when the number of people suddenly gets smaller?" with the following options: 
- competing for resources
 - competition
 - A Greek letter
 - heat or cold
 - Earth orbiting the Sun
 - permineralization
 - bottleneck effect
 - relocation


 

       bottleneck effect  