All sponges lack the complex organs and true tissues needed to form the excretory, circular, digestive and respiratory systems. All the nutrients a sea sponge needs are carried via water. The nutrients diffuse through the sponges' pore cells and are then expelled through the sponge’s osculum. The osculum is capable of propelling metabolic waste at a relatively high velocity for large distances away from the sponge. Sea sponges also rely on water currents to carry out basic circulation, digestion and respiration.
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