You are presented with the question "Ecology studies something that decreases when an animal species is what?" and the following answer choices: 
- omnivores
 - harmed
 - deadly
 - dead
 - haploid
 - negative
 - dormant
 - inactive

Now knowing that harming an animal species causes that animal 's population to decrease and ecology is the study of populations or communities, choose the best answer.


 

  harmed       