Cnidaria

Cnidarians are animals with radial symmetry and live in water. Some of these animals move, some do not. Cnidarians are some of the simplest organisms found in the water.Cnidarians include animals such as sea anemones (that's what nemo lived in), jellyfish, and coral.
cnidarians have radial symmetry, they have more than one line where they can be divided into two equal halves, like the pie shown below.Cnidarians have one body opening, the gastrovascular cavity, is used a cnidarians as both a mouth and an anus. Like many simpler organisms, cnidarians do not have a circulatory system or respiratory, instead they exchange

gasses by diffusion. Cnidarians have a netlike nervous system, with nerves all around the mouth and branching to the rest of the organism. Cnidarians reproduce asexually by budding, and sexually when the male sperm and the female egg are released into the water and unite to become a fertilized zygote.