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What are facts about echinoderms?

Echinoderms are made up of starfish, sea cucumbers, brittle stars, sea urchins, etc.Echinoderms are organisms in the phylum Echinodermata, which is Latin for "spiny-skinned."Echinoderms have radial symmetry, which means that you can divide them into sections with a central point like spokes on a wheel (ex. divide them into eight equal sections), and each section would be the same. To better understand this, see the question "What is radial symmetry?"Echinoderms live in the ocean.Echinoderms don't have hearts or brains.Echinoderms have tube feet, which are similar to suction cups. The tube feet stick on to surfaces or prey.This answer is more relevant than the previous one, which stated "I'll put the answer later. Here's an interesting poem: FleasAdamHad 'Em"we learned about that in sciencewe learned about that in science