Fact 1: Echinoderms lack respiratory and excretory systems. Fact 2: All echinoderms are marine and benthic. Given the two facts above, what creatures lack respiratory and excretory systems?

Available choices: I. Plant growth is reduced; II. marine and benthic; III. barnacles; IV. epidermis and dermis; V. They may not survive.; VI. kalenchoes; VII. graptolites; VIII. movement of tectonic plates;
Answer:
II.