You are presented with the question "What are simple units which are neither prokaryotes nor eukaryotes?" and the following answer choices: 
- ferns
 - viruses
 - barnacles
 - plants
 - bushes
 - fungi
 - insects
 - animals

Now knowing that viruses are not cells at all, so they are neither prokaryotes nor eukaryotes and viruses Viruses Viruses are simple units which invade cells, choose the best answer.


 

  viruses       