Sharks and jellyfish are similar to, and different from, each other in several ways. One similarity is that both animals live in the ocean. Another similarity is that both sharks and jellyfish can hurt people and other animals. A shark can bite with its sharp teeth, and a jellyfish can sting with its tentacles. Although there are similarities between these animals, there are also important differences. One difference is that sharks are vertebrates, and jellyfish are invertebrates. This means that, unlike sharks, jellyfish do not have backbones or brains. Sharks and jellyfish also have different life spans. Most jellyfish live only a few months. In contrast, most sharks live 15-20 years. These facts show that sharks and jellyfsh are similar and different at the same time.