Use reasoning to answer the following question.
What do echinoderms lack?\nOptions:\n- (A) Lungs\n- (B) Mass\n- (C) oxygen\n- (D) eardrum\n- (E) gills\n- (F) ovaries\n- (G) Organs\n- (H) Bodies

(A)
Echinoderms lack respiratory and excretory systems.

Lung mechanics and gas exchange are topics during study of the respiratory system.

Echinoderms have no lungs.

.

Final answer: (A)