Q: What lack respiratory and excretory systems?\nOptions:\n- (A) They may not survive.\n- (B) members of their own species\n- (C) platypus\n- (D) humans\n- (E) crinoids and blastoids\n- (F) passenger pigeons\n- (G) graptolites\n- (H) whales
Let's think step by step below.

User
Echinoderms lack respiratory and excretory systems. Echinoderms in the diorama include the crinoids and blastoids. Crinoids and blastoids lack respiratory and excretory systems.
Thus, the answer is (E).
Assistant