KnowraSpongeLinked fromLinked fromThe 21 pages that link to Sponge, each with the reason it gives.All 21Broader topic 6Related 4Narrower topic 7Compared with 4CnidariaCompared with: Sponges provide a comparison with cnidarians' organized tissues and nerve cells.Bilateral symmetryCompared with: Many sponges have irregular forms rather than a bilaterally organized body plan.Gastrovascular cavityCompared with: Sponges lack a gastrovascular cavity and distribute digested nutrients among cells by other means.Germ layerCompared with: Sponges show that early animal development does not always produce true germ layers.