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Text File  |  1992-09-02  |  276b  |  9 lines
  1. A sponge is any saclike simple invertebrate 
  2. of the phylum Porifera, usually marine. A 
  3. sponge has a hollow body, its cavity lined by 
  4. cells bearing flagellae, whose whiplike 
  5. movements keep water circulating, bringing in 
  6. a stream of food particles. 
  7.  
  8. Subject by: Vince Pike
  9.