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In the question we have been asked to describe the features of echinoderms and of sea stars.
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Solution for the question is general features of echidonoderms are, they are spherical or elongated with star -like appearance.
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Next is, they are exclusively marine animals.
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Next is, they have spiny skin.
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They are ploblastic with a sea.
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Cellomy cavity.
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Skeleton is made up of calcium carbonate.
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They have an open circulatory system.
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They aspire through gills or cloocal respiratory tree.
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They have a simple radial nervous system.
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There is absence of excretory system in them.
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The next is the body is unsegmented with no distinct head.
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The mouth is present on the ventral side while the pecal matter is ejected from dorsal side.
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Next is the tube feed aids in locomotion.
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Next is they reproduce as sexually through gametic fusion and as sexually through regeneration.
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Fertilization is external...