Fact 1: Echinoderms lack respiratory and excretory systems.

Fact 2: All echinoderms are deuterostomes .

Given the two facts above, answer the question "What lack respiratory and excretory systems?" with the following options: 
- deuterostomes
 - barnacles
 - cigarettes
 - graptolites
 - fish
 - humans
 - kalenchoes
 - birds


 

 deuterostomes        