Sponges do not have speciliazed respiratory organs. Simple diffusions is enough to support all cells with oxygen. Water flows into a sponge througt side openings and out of the top opening osculum. The water current provides both food and oxygen removes waste products. All of the cells in the sponge obtain their oxygen from the circulated water. Flatwarms also do not need respiratory organs as like lungs or gills, simple diffusion occur for gas exchange.
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