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4 Written questions

3 Multiple choice questions

  1. no body cavity
  2. intracellular
  3. 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 True/False questions

  1. What kind of feeding?Sponges are sessile (sedentary), filter feeding animals


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


  3. What are choanocytes?They lack tissues, organs, and organ system.