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There are four classes of sponges classified so far. The classification is based on the difference in basic cell structure and type. They are,

  1. Calcarea - has single nuclues and single external membrane.
  2. Glass Sponges - has multinucleated cell.
  3. Demosponges - same as calcerea but their spicules are made of silica whereas for Calcarea it is made of calcite.
  4. Homoscleromorpha - same as Demosponges except for the different body structure it has. It is the most recently classified class.
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10y ago
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15y ago

there are approximatly 9000 known species of sponges that feed on bacteria

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Q: How many types of sponges are there?
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