You are presented with the question "Prokaryotes are single celled living things in the animal kingdom that don't have a what?" and the following answer choices: 
- epidermal
 - genus
 - complex
 - extinction
 - food
 - nucleus
 - properties
 - alleles

Now knowing that prokaryotes are single-celled organisms that lack a nucleus and an organism is a living thing, choose the best answer.


 

      nucleus   