Let's think step by step! Crustaceans and insects have what special structures?\nOptions:\n- (A) the eyes\n- (B) a cuticle\n- (C) internal\n- (D) excretory\n- (E) invisible\n- (F) Chlorophyll\n- (G) fur and fat\n- (H) muscled
The thinking starts now:
User
Some arthropods have special excretory structures. Crustaceans are, like insects, arthropods. Crustaceans and insects have special excretory structures. The final answer: (D).
Assistant