Bottleneck effect occurs when a population suddenly gets much smaller, and population is the number of people. Given these facts, what is it called when the number of people suddenly gets smaller among the following options:
- competing for resources
 - competition
 - A Greek letter
 - heat or cold
 - Earth orbiting the Sun
 - permineralization
 - bottleneck effect
 - relocation


 

       bottleneck effect  