what lack respiratory and excretory systems?
fish graptolites starfish waste humans barnacles insects ferns
A B C D E F G H
Starfish and sea urchins are also echinoderms.
starfish lack respiratory and excretory systems
what lack respiratory and excretory systems? (A) fish (B) graptolites (C) starfish (D) waste (E) humans (F) barnacles (G) insects (H) ferns