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4 Written questions

3 Multiple choice questions

  1. intracellular
  2. Specialized flagellated cells, choanocytes, move water through and filter food particles from the water
  3. no true tissue

3 True/False questions

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


  2. 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.


  3. What is the sponge body comprised of?Sponges are sessile (sedentary), filter feeding animals