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4 Written Questions

3 Multiple Choice Questions

  1. no true tissue
  2. Sponges are sessile (sedentary), filter feeding animals
  3. no body cavity

3 True/False Questions

  1. How do the sponges have structure and strength?Extracellular protein fibers give structure and strength to the sponge body and spicules, spines made of silica or calcium carbonate, offer protection from predation.


  2. what do they lack?Sponges are sessile (sedentary), filter feeding animals


  3. where does gas exchange occur?Gas exchange and excretion occur via diffusion across individual cell membranes.


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