Prokaryotes are single-celled organisms that lack a nucleus, and bacteria and archaebacteria are prokaryotes. Given these facts, bacteria and archaebacteria examples of what among the following options:
- grass
 - multi-celled organisms
 - seeds
 - Something that causes allergies
 - major threat to health
 - single-celled organisms
 - microorganisms
 - Food poisoning


 

      single-celled organisms   