Introns are regions that do not code for proteins, and prokaryotes lack introns, whereas eukaryotes contain introns. Given these facts, what lacks regions that do not code for proteins among the following options:
- prokaryotes
 - human cells
 - peachleaf willow
 - graptolites
 - barnacles
 - plant cells
 - eukaryotes
 - gastropod shells


 

 prokaryotes        