Almost surely, freshwater sponges live where you live, in the water you drink. The sponges we sequenced for the E. muelleri genome came from the head tank of the Victoria British Columbia drinking water system. This water is pristine, carefully protected from humans by a boundary around a reservoir far from human habitation. It's clean. Sponges filter water for bacteria and small unicellular plankton and they grow and excrete wastes as tiny particles.
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