Fact 1: Viruses are not cells at all, so they are neither prokaryotes nor eukaryotes.

Fact 2: Viruses Viruses Viruses are simple units which invade cells.

Given the two facts above, answer the question "What are simple units which are neither prokaryotes nor eukaryotes?" with the following options: 
- ferns
 - viruses
 - barnacles
 - plants
 - bushes
 - fungi
 - insects
 - animals


 

  viruses       