Move water through sponge10/3/2023 ![]() ![]() Sponges are sessile, they live in one place, where they are fixed to the ground. Homoscleromorpha are a class which was part of the Demosponges.These sponges make for about 7% of all known sponges. There are about 500 different kinds of glass sponges, in 17 different families. Most of these live very deep in the ocean. They are sometimes called Hexactinellida. Glass sponges use silicon dioxide to make their skeletons. ![]() Of the about 15,000 sponges known, about 400 are Calcarea. They are usually very small, only 3-4 inches in height. ![]()
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