Fact 1: Echinoderms lack respiratory and excretory systems.

Fact 2: Echinoderms are represented by the starfish.

Given the two facts above, answer the question "_ lack respiratory and excretory systems." with the following options: 
- graptolites
 - insects
 - ferns
 - barnacles
 - fossil fuels
 - Allergies
 - starfish
 - parasites


 

       starfish  