Fact 1: Echinoderms lack a centralized nervous system. Fact 2: Echinoderms are represented by the starfish. Given the two facts above, what is something missing in starfish?

Choose from: a. the body's largest organ b. centralized nervous system c. characteristics d. layers of fat e. permineralization f. biological diversity g. kinetic energy h. A compound that donates proton
Answer:
b.