What lack respiratory and excretory systems?
deuterostomes barnacles cigarettes graptolites fish humans kalenchoes birds
A B C D E F G H
All echinoderms are deuterostomes .
deuterostomes lack respiratory and excretory systems
What lack respiratory and excretory systems? (A) deuterostomes (B) barnacles (C) cigarettes (D) graptolites (E) fish (F) humans (G) kalenchoes (H) birds