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PoriferaSaturday, February 10, 2007. WHAT IS A SEA SPONGE? Although sea sponges may look like plants, they are the simplest of multi-cellular animals. Sea sponges are bottom-dwelling invertebrate. Creatures that are primarily marine, however there are a small number of sponge species that can live and survive in freshwater regions. The scientific term for sponges is. Which literally means "pore-bearing". The surface of a sea sponge is made up of thousands of tiny pores, called ostia. 1 No definite symmetry.
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