The small pores, called ostia, of the sponge draw water into the sponge. The water is circulated throughout it's body by cells called choanocytes. The choanocyte cells are equipped with flagella. Flagella are whip-like structures that move around and push water through the sponge. As water is swished throughout the sponge, food and oxygen are brought to the sponge while waste and carbon dioxide are removed.
Wrong Yellow Sponge!