Fact 1: Having no natural predators increases population size.

Fact 2: Koalas have no natural predators.

Given the two facts above, answer the question "What has an increased population size over time?" with the following options: 
- trout
 - dolphins
 - squids
 - Frogs
 - dodos
 - koalas
 - white lions
 - Tasmanian tigers


 

      koalas   