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Sponges
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| Phylum: Porifera | |
| (Most sponges are difficult to classify on external appearance and require microscopic examination of the spicules to provide accurate identification). | |
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Sponges form many different shapes from tall finger like sponges and flat sheets such as those in this picture, to encrusting forms that form a layer of the surface of rocks and other objects. Even the same species can have different forms depending on where it grows.All sponges are arranged in a way that maximises the flow of water around them. |
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