Final answer:
Bryozoans show excretion through a system called Malpighian tubules, which allow metabolic wastes like uric acid to be excreted as a thick paste or powder.
Step-by-step explanation:
Bryozoans, which are aquatic invertebrate animals, show excretion through a system called Malpighian tubules. These tubules allow metabolic wastes, such as uric acid, to freely diffuse into them. The uric acid is then excreted as a thick paste or powder, helping the organisms conserve water.