Echinoderms lack respiratory and excretory systems, and all echinoderms are marine and benthic. Given these facts, what creatures lack respiratory and excretory systems among the following options:
- Plant growth is reduced
 - marine and benthic
 - barnacles
 - epidermis and dermis
 - They may not survive.
 - kalenchoes
 - graptolites
 - movement of tectonic plates


 

  marine and benthic       