There are many animals and plants living in the ocean, and sometimes it is not easy to tell whether these creatures are animals or plants. For example, although starfish do not look like animals, they are actually animals rather than plants. The same is true of jellyfish, which may often stay in one place and do not move, but they are not plants, but animals. Specifically, jellyfish are a kind of jellyfish, they belong to the class of jellyfish, jellyfishes. Wild jellyfish live in the ocean and feed on zooplankton. However, they can also be cultured artificially, and the edible and nutritional value of jellyfish is relatively high.
As mentioned above, jellyfish is a kind of organism under the class Jellyfish, so it belongs to jellyfish in terms of family and genus. In addition, jellyfish is a relatively low level of organisms, because jellyfish is a coelenterate. Coelenterates are invertebrates. Compared with the complex body structure of vertebrates, the body structure of invertebrates is generally simple. The same is true of coelenterates, which have many missing structures. For example, coelenterates do not have specialized respiratory organs, nor specialized organs for excretion and so on. Their bodies are usually made up of several layers of cells directly surrounding the gastric circulation cavity; Through the mouth, the gastric circulation cavity can communicate with the outside.
As a coelenterate, the body structure of jellyfish is also very simple. They do not have lungs or gills and other respiratory organs that other animals have, nor do they have brains, nor do they have hearts, etc. Generally speaking, they are relatively low.
