- Both corals (Cnidaria) and sponges create chemicals so they do not become infected and other organisms cannot grow on them.
- Cnidarians and sponges have symbiotic relationships with organisms that are not animals.
A difference between phylum Porifera and phylum Cnidaria.
- Sponges manufacture a toxic chemical to fend off the enemy, while Cnidarians sting enemies/prey with nematocysts which are connected to a simple nervous system.
A similarity between phylum Cnidaria and phylum Platyhelminthes.
- They both use a gastrovascular cavity as their digestive system.
A difference between phylum Cnidaria and all the other animal phyla.
- Only Cnidarians use nerve nets as their nervous system to capture prey and to protect itself.
