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What makes echinoderms unique to all other animals? (think of systems/structures they have that no other animal has!)
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What makes echinoderms unique to all other animals? (think of systems/structures they

have that no other animal has!)

User Gareth McCumskey
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Although these spines may look like components of an exoskeleton at first glance, echinoderms do not have an exoskeleton. This is partly due to their symmetry and their spiny endoskeleton.
User Tyr
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