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Overview of Phylum Porifera (Sponges) by ScribdTranslations is a document available to read on EtoBox.

Poriferans, known as sponges, are among the oldest fossil animals, dating back to the Upper Precambrian, and are classified into three groups: Hexactinellida, Demospongia, and Calcarea. These organisms have a unique feeding system based on pores and specialized cells, without having distinct organs, and their structure varies from simple to complex forms. Sponges have had a significant impact on marine ecosystems, contributing to reef formation throughout geological history.

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