OPTIONS:
(a). deuterostomes.
(b). Veins and arteries..
(c). barnacles.
(d). alpacas.
(e). solid, liquid, gas.
(f). sensory neurons.
(g). gastropod shells.
(h). graptolites.

Fact 1: Adult echinoderms have radial symmetry. Fact 2: All echinoderms are deuterostomes . Given the two facts above, what have radial symmetry?
Answer:
(a).