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Sponges are classified within the phylum Cnidaria and are relatively simple multicellular organisms that predominantly inhabit marine environments. Their most distinctive feature is the presence of stinging cells called cnidocytes. In older classifications, Cnidaria and Ctenophora were grouped together under the heading “Coelenterata,” but in modern systematics, these two groups are recognized as separate phyla. Morphological Structure and Cellular Features Members of Cnidaria are diploblastic o