How can endoskeleton of echinoderms be characterized
How can endoskeleton of echinoderms be characterized in the comparison of analogous structures existed in arthropods, vertebrates, and molluscs?
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The echinoderm skeleton is interior that is it is an endoskeleton. It is made up of calcium carbonate (or calcareous).Vertebrates as well contain internal skeleton made up of bones and cartilages. Arthropods contain an external carapace made up of chitin, a chitinous exoskeleton. Various molluscs present a calcareous shell which works as exoskeleton.
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