Which Group is Most Closely Related to the Echinoderms? A Surprising Answer

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Echinoderms are a diverse group of marine animals that include starfish, sea urchins, sand dollars, sea cucumbers and crinoids. They are characterized by their radial symmetry, spiny skin, water vascular system and calcareous endoskeleton. But which group of animals is most closely related to them? The answer may surprise you. Echinoderms and Chordates: A Common … Read more