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4 Written questions

3 Multiple choice questions

  1. Gas exchange and excretion occur via diffusion across individual cell membranes.
  2. no true tissue
  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 are choanocytes?They lack tissues, organs, and organ system.


  2. What kind of feeding?intracellular


  3. what do they lack?They lack tissues, organs, and organ system.


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