Cnidaria
Cnidaria organism are found in large bodies of saltwater. These animals are able to move to capture prey, however their movement is limited. They all contain gastrovascular cavities located in the center of its body. This is where all of their food gets digested. They also use the hole in the center of its body as a mouth and anus. This is because they intake food initially, but when they diminish the body of nutrients, it is expelled from the body. Cnidaria also use special enzymes to break down their food and destroy the venom they put into their target. Because of these characteristics, organisms that contain these traits are classified as part of the cnidaria family.