Cnidarians

In science we are learning about animals, but this week we are focusing more on sponges and Cnidarians. Cnidarians interest me more because they don't just sit there and inhale water for food. Cnidarians use stingers to capture and poison prey. Cnidarians are either a medusa or a polyp. Polyps anchor down to a hard surface and use their stingers to capture prey that gets too close. Both have a central body cavity and expel waste through their mouth. Medusa cnidarians can move around to capture their prey with their stingers. Polyps create coral reefs which is really cool. Polyps grow hard exoskeletons that stay after they die, creating new space for new polyps to grow, and after a few generations a beautiful coral reef is born.