Assertion: echinoderm's skeleton | /r/HasProperty | internal
Facets:
Source sentences:
text: Even though they’re invertebrates, echinoderms have internal skeletons just like we do.
text: Echinoderms have an internal skeleton made up of an arrangement of ossicles (plates made mostly of calcium carbonate), connected by a special kind of connective tissue called 'catch connective tissue' or 'mutable collagen' or 'mutable connective tissue'.
text: Echinoderms have internal skeletons and not externals ones like arthropods.
text: Although all living echinoderms have a pentamerous (five-part) radial symmetry, an internal skeleton, and a water-vascular system derived from the coelom (central cavity), their general appearance ranges from that of the stemmed, flowerlike sea lilies, to the wormlike, burrowing sea cucumbers, to the heavily armoured intertidal starfish or sea urchin.