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    There are three subgroups of sponges. The glass sponges have a skeleton that consists of fragile, glass-like spicules that are made of silica. The demosponges are often vibrantly colored and can grow to be the largest of all sponges. The demosponges account for more than 90 percent of all living sponge species. The calcarious sponges are the only group of sponges to have spicules that are made of calcium carbonate. Calcarious sponges are often smaller than other sponges.