Are sea urchins bilateria?

No, a sea urchin and a sea anemone are two different sea creatures nothingalike. They do have some alike characteristics.like they both use their long tentacles , or spikes for protection.

No. Sea urchins are animals, which eat algae. They use there spines to make sure no fish eat them, and their mouths are on the bottom of them. They move around on almost invisible legs.

Sea urchins move using their tube feet and spines on the underside of their body. they use their water vascular system. THis is where they pump water into their feet and when they touch the ground...

No, sea urchins are animals. They are echinoderms (meaning "spiny skin") and are related to sea stars, sea cucumbers, and sand dollars. They eat kelp and other forms of algae.

They poke you if you touch them.