You are presented with the question "Bacteria and archaebacteria examples of what?" and the following answer choices: 
- grass
 - multi-celled organisms
 - seeds
 - Something that causes allergies
 - major threat to health
 - single-celled organisms
 - microorganisms
 - Food poisoning

Now knowing that prokaryotes are single-celled organisms that lack a nucleus and bacteria and archaebacteria are prokaryotes, choose the best answer.


 

      single-celled organisms   