Sponge Wall Structure: Maximizing Nutrient Absorption

The sponge wall contains numerous small pores called ostia, which allow water to flow into the sponge's body cavity. The water then passes through a series of canals and chambers, where nutrients are filtered out and absorbed by the sponge's cells. This system of pores and canals greatly increases the surface area of the sponge, which allows it to absorb more nutrients from the water.