You are presented with the question "what creatures lack respiratory and excretory systems?" and the following answer choices: 
- Plant growth is reduced
 - marine and benthic
 - barnacles
 - epidermis and dermis
 - They may not survive.
 - kalenchoes
 - graptolites
 - movement of tectonic plates

Now knowing that echinoderms lack respiratory and excretory systems and all echinoderms are marine and benthic, choose the best answer.


 

  marine and benthic       