![]() 400 MY ago sponges dominated the oceans as reef builders eg. newly discovered(2010) fossils that may be sponges have been found in 635-659 MY old rocks eg. ![]() first signs of multicellular life are in 750 MY old rock, in this same rock are unique chemical signatures of sponges eg. ![]() Download Phylum Porifera (Sponges) and more Biology Summaries in PDF only on Docsity!Animals –Animal Phyla: Porifera Ziser Lecture Notes, 2015.9 1 Phylum Porifera (Sponges) ~9,000 living species >2200 fossil forms abundant fossil record eg.
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