4 Written questions
3 Multiple choice questions
- no body cavity
- Extracellular protein fibers give structure and strength to the sponge body and spicules, spines made of silica or calcium carbonate, offer protection from predation.
- 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
where does gas exchange occur? → Specialized flagellated cells, choanocytes, move water through and filter food particles from the water
• Number of tissue → no true tissue
What kind of feeding? → intracellular