Explain one arthropod feature that was a preadaptation for living on land. Explain your response. Mollusca b. Crustacea c. Echinodermata e. both a. and d. 49. Describe the structures and function of a water vascular system, including ring canal, radial canal, tube feet and ampula.
Echinoderms have a coelom.
Echinoderms have a stomach. Echinoderms are radially symmetrical as adults. Echinoderms are radially symmetrical as larvae. You discover an animal with bilateral symmetry, a pseudocoelom, a tubular digestive system, and a thick multilayer cuticle. Select the group to which this animal most likely belongs.