You are presented with the question "What are single-celled organisms that lack a nucleus?" and the following answer choices: 
- ferns
 - barnacles
 - Most plants
 - cacti
 - Leeuwenhoek
 - orchids
 - bacteria
 - PDAs

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


 

       bacteria  