You are presented with the question "What has an increased population size over time?" and the following answer choices: 
- trout
 - dolphins
 - squids
 - Frogs
 - dodos
 - koalas
 - white lions
 - Tasmanian tigers

Now knowing that having no natural predators increases population size and koalas have no natural predators, choose the best answer.


 

      koalas   