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Phylum Porifera (Sponges) - Austin Community College District

all other animal groups descended from this ancestor - the earliest sponges in symbiosis with bacteria may have significantly helped to aerate the ancient oceans making them more suitable for animal diversification sponges are some of the simplest animals all sponges are sessile Animals –Animal Phyla: Porifera; Ziser Lecture Notes, 2015.9 2