PPT - Phylum Porifera PowerPoint Presentation, free download - ID:5346840
Phylum Porifera | manoa.hawaii.edu/ExploringOurFluidEarth
American Museum of Natural History - Sponges (phylum Porifera) are among the simplest of animals. They have no true organs or tissues, just reproductive, feeding, and skeleton-building cells. They are hollow, taking
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Phylum Porifera: Sponges have specialized cells but no tissues; no symmetry –Sponges are the most primitive animals on Earth 570 million year old fossils. - ppt download
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