1. Sponges have a water transport or canal system. 2. Water enters through minute pores (osculum) in the body wall into a central cavity, spongocoel, from where it goes out through the ostia. 3. This pathway of water transport is helpful in food gathering, respiratory exchange and removal of waste. Regarding 1,2 and 3:
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Sponges belong to phylum porifera,which has special system to trasport water...through ostia,which is opening,water enters into spongocoel and exists through osculum..For excretion,respiration and nutrition,this pathway is used..
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