Fact 1: Echinoderms lack respiratory and excretory systems.

Fact 2: Starfish and sea urchins are also echinoderms.

Given the two facts above, answer the question "What is an example of an animal that lacks a respiratory and excretory system?" with the following options: 
- Dog
 - Human
 - alpacas
 - cacti
 - Starfish
 - Leeuwenhoek
 - Elephants
 - cows


 

     Starfish    