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Economic significance of sponges

Elucidate the economic significance of sponges?

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Various chemical substances secreted by sponges contain anti-inflammatory, antibiotic and anti-tumoral activities; they are employed in the production of medicines. As ancient times the endoskeleton of certain sponges has had commercial value, they are employed as cleansing implements for baths (that is, bath sponges), to wash animals, objects and so forth.

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