Fact 1: Echinoderms lack respiratory and excretory systems.

Fact 2: All echinoderms are deuterostomes .

Given the two facts above, answer the question "some what lack respiratory systems?" with the following options: 
- Smoking
 - respiratory systems
 - deuterostomes
 - cigarettes
 - alpacas
 - hawks
 - barnacles
 - pigs


 

   deuterostomes      