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4 Written questions

3 Multiple choice questions

  1. no body cavity
  2. Extracellular protein fibers give structure and strength to the sponge body and spicules, spines made of silica or calcium carbonate, offer protection from predation.
  3. The sponge body is comprised of a couple different cell types that form the outside and inside layers of the body wall.

3 True/False questions

  1. where does gas exchange occur?Specialized flagellated cells, choanocytes, move water through and filter food particles from the water


  2. • Number of tissueno true tissue


  3. What kind of feeding?intracellular


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