Chapter 26: Sponges, Cnidarians, and Unsegmented Worms

The nematocysts of most jellyfish are harmless to humans, but a few can cause painful stings. One tiny Australian jellyfish has a toxin powerful enough to cause death in 3 – to 20 minutes. Sea Anemones and Corals. Class _____ Most beautiful and ecologically important invertebrates ................
................