Phylum of animal kingdom
Name the other phylum of animal kingdom present species with exoskeleton?
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Arthropods present exoskeleton made up of chitin. Echinoderms do not contain exoskeleton but they present a calcareous endoskeleton. Various chordates also contain an external carapace.
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How can endoskeleton of echinoderms be characterized in the comparison of analogous structures existed in arthropods, vertebrates, and molluscs?
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