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

Fact 2: Animals and plants exist as populations.

Given the two facts above, answer the question "When an animal or plant group gets much smaller, that's called a:" with the following options: 
- bottleneck
 - Winter
 - Movement
 - population explosion
 - genus
 - relocation
 - Mason jar effect
 - choker


 

 bottleneck        