You are presented with the question "_ lack respiratory and excretory systems." and the following answer choices: 
- graptolites
 - insects
 - ferns
 - barnacles
 - fossil fuels
 - Allergies
 - starfish
 - parasites

Now knowing that echinoderms lack respiratory and excretory systems and echinoderms are represented by the starfish, choose the best answer.


 

       starfish  