Fact 1: Echinoderms lack respiratory and excretory systems.

Fact 2: All echinoderms are marine and benthic.

Given the two facts above, answer the question "what creatures lack respiratory and excretory systems?" with 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       