Echinoderms lack respiratory and excretory systems.
Starfish and sea urchins are also echinoderms.
Starfish lack respiratory and excretory systems.
What kind of animal doesn't have a respiratory or excretory system?
[1] a fish
[2] bears
[3] ant
[4] whale
[5] humans
[6] starfish
[7] mammals
[8] llama