Question

All of the following are arthropods except
a. crustaceans.
b. echinoderms.
c. arachnids.
d. insects.

Answer 1

Echinoderms are not arthropods like the others. Starfish and sand dollars are echinoderms.

Answer 2

Answer: The correct answer is -

b. echinoderms.

Arthropoda is a phylum of invertebrates that includes organisms with jointed appendages and it is the largest phylum.

Echinodermata is a different phylum of invertebrates that includes exclusively marine organisms with three germ layers and true coelom.

Example of Echinoderms- Starfish.

Thus, option b) Echinoderms is the right answer.