Fact 1: Echinoderms lack respiratory and excretory systems.

Fact 2: Echinoderms are represented by the starfish.

Given the two facts above, answer the question "What lacks respiratory and excretory systems?" with the following options: 
- the Sun
 - insects
 - starfish
 - barnacles
 - ferns
 - water
 - Conifers
 - humans


 

   starfish      