You are presented with the question "What has caused harm to the bird population?" and the following answer choices: 
- feral dogs
 - migration
 - habitait loss
 - amoebae
 - hypothyroidism
 - fuel emmisions
 - Pesticides
 - viruses

Now knowing that harming an animal species causes that animal 's population to decrease and habitat loss is the major reason for the decrease in the bird population, choose the best answer.


 

   habitait loss      