How do sea sponges move water and feed?12/6/2023 ![]() Their skeleton is formed from spicules made of silica (a glass-like material), calcium or calcium carbonate materials, and spongin, a protein that supports the spicules. Some types have been found to live over 200 years. ![]() They come in many different colors, sizes, and shapes and, since very few animals eat them, they can live for a very long time. Sponges are classified as invertebrates, which means they do not have backbones, and they make up an entire phylum of animals ( Phylum porifera). Some of these cells are in charge of digestion, some of reproduction and others for bringing in and filtering water so that the sponge can feed. ![]() They also do not have tissues or organs like other animals do, rather, they have specialized cells to perform necessary functions. They are relatively basic multi-celled animals without a brain or a central nervous system.
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