Bottleneck effect occurs when a population suddenly gets much smaller, and populations are large groups of individuals. Given these facts, what suddenly gets much smaller with the bottleneck effect among the following options:
- a lot of human deaths
 - tectonic plates being pushed together
 - our nearest star
 - Decreased precipitation
 - Inches or fractions of inches.
 - large groups of individuals
 - the wearing away of rock
 - a hemisphere is tilted away from the sun


 

      large groups of individuals   