Which of the following is a characteristic of echinoderms?

A) radial symmetry in adults
B) endoskeleton of spiny, calcium-rich plates
C) bilateral symmetry in larva
D) both sexual and asexual reproduction
E) All of the answer choices describe characteristics of echinoderms.

Echinoderms

A phylum of marine animals that includes starfish, sea urchins, and sea cucumbers, characterized by radial symmetry and a unique water vascular system.

Radial Symmetry

A symmetrical arrangement of parts around a central axis, as seen in many aquatic organisms, allowing them to interact with their environment from any direction.

Endoskeleton

An internal support structure of the body, found in vertebrates, consisting of bones and cartilages.