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The Asterozoa are a subphylum in the phylum Echinodermata. Characteristics include a star-shaped body and radially divergent axes of symmetry. The subphylum includes the two classes Asteroidea, the st ...
Wikipedia Article
An endoskeleton (From Greek ??d??, éndon = "within", "inner" + s?e?et??, skeletos = "skeleton") is an internal support structure of an animal, composed of mineralized tis ...
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