SpongesWe might think of sponges as bathroom objects, but the real living animals are far more interesting. They come in all shapes and sizes, occur in all oceans of the world, and have amazing lives. Sponges have lived in our oceans for 600 million years. Ancient forms even built reefs bigger than the Great Barrier Reef. Today, sponges help clean our oceans, are experts in chemical warfare, and can rebuild themselves after being torn apart. Some even live