Porifera
Porifera, or more commonly known as sponges, are some of the oldest organisms on the earth. They were once referred too as plant animals, because they cant move and are attached to a rock for most of their life. Porifera don't actually have a digestive system. They don't have any organs, so have different ways of attaining nutrients.
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Stovepipe Sponge
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Red Boring Sponge
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Grantia
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