The vertebrate is basically anendoskeletonmade up of two types of tissues (bone and cartilage).
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In other echinoderms, theendoskeletonis associated with a layer of muscle that allows the animal to move its arms or other body parts.
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Theendoskeletonshows a large or complete lack of ossification.
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However, eriptychiids differ from all other pteraspidomorphs in having a massively calcifiedendoskeleton, pervaded by canals for blood vessels.
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They form part of theendoskeletonand provide rigidity and protection.
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The pores are perforations in theendoskeletonthrough which podia for gas exchange project from the body.
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The dermis contains anendoskeletonof calcium carbonate components known as ossicles.
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Keyhole sand dollars are so named because of the distinctive keyhole-shaped perforation toward the rear of theendoskeleton.
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It has anendoskeletonjust below the skin.
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The body has anendoskeletonmade from a number of articulated calcareous plates known as ossicles covered by a thin epidermis.
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During early embryonic development theendoskeletonis composed of notochord and cartilage.
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The larvae form a sophisticatedendoskeletonthat is made of two spicules.
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He takes damage to his biological covering, revealing his metalendoskeleton.
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It has anendoskeletonof calcified ossicles and is covered in a fleshy layer of skin giving it a rubbery appearance.
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Bones are rigid organs that form part of theendoskeletonof vertebrates.
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