4 Written Questions
3 Multiple Choice Questions
- no true tissue
- Sponges are sessile (sedentary), filter feeding animals
- no body cavity
3 True/False Questions
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.
what do they lack? → Sponges are sessile (sedentary), filter feeding animals
where does gas exchange occur? → Gas exchange and excretion occur via diffusion across individual cell membranes.