Echinoderms lack respiratory and excretory systems.
All echinoderms are marine and benthic.
Marine and benthic creatures lack respiratory and excretory systems.
what creatures lack respiratory and excretory systems?
Options:
  * Plant growth is reduced
  * marine and benthic
  * barnacles
  * epidermis and dermis
  * They may not survive.
  * kalenchoes
  * graptolites
  * movement of tectonic plates