![]() ![]() Still, they are multicellular animals, which means that they are made up of many cells that work together, like in the human body. ![]() Unlike humans, sponges do not have stomachs, organs, backbones, or blood. Notice the many unique shapes of the spicules. (H) Spicules are microscopic structures, made of silica (glass) or calcium carbonate (similar to limestone), that make up a sponge’s body.
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