Is a jellyfish unicellular or multicellular, and why is the water inside a jellyfish cell free water

Multicellular. Jellyfish are multicellular organisms.

Because unicellular organisms are made up of only a single cell, they often aggregate into colonies of cells. While most of the organisms that can be seen with the naked eye are multicellular organisms, all the organisms of the plant kingdom and all the animal kingdoms except for the phylum Myxophylum are multicellular organisms. Jellyfish, corals, and anemones have different tissues, each of which is made up of differentiated, interconnected cells, each with a specific function.

The tissues of jellyfish include the epidermis which plays a protective role, the neural network that plays a sensory role, and the gastric peel which plays a digestive role, and different cells have different functions. It can be seen that jellyfish is not composed of a single cell, but an organism composed of multiple, differentiated cells, each with differentiated, specialized functions.

Extended Materials. The jellyfish bodies of the class Bowl Jellyfish are generally large in size and do not have a marginal membrane. The gastric circulation lumen is complex, the radiation tube is well developed, and there are gastric filaments of endodermal origin, and there are stinging cells on the gastric filaments.

The mesocolloid layer contains cells and fibers of ectodermal origin. Germ cells originate from the endoderm, and hydroids are all in the ectoderm. The neural senses are well developed, and 4-8 sensory organs are concentrated to form them.

The digestive circulation cavity of jellyfish is complex, the radiation tube is developed, and the gastric filament originating from the endoderm has stinging cells, so there are stinging cells in the endoderm and ectoderm of the jellyfish. Jellyfish generally have stinging cells on the outer surface of their tentacles, hanging lips, mouth, wrists, and umbrellas. In some species, the gonadal area of the lower umbrella surface is concave inward to form the genital fossa, the function of which is unknown, and may be related to the respiration of the animal.

The mesocolloids of the jellyfish are well developed and are also gels formed by proteins and mucopolysaccharides, which contain collagen fibers. Different from hydroid jellyfish, there are amoebocytes of ectodermal origin in the mesocolloid, and these amoebocytes play an important role in animal regeneration and tissue repair. The mesocolloidal layer also has great elasticity, because it can maintain and regulate the composition and concentration of ions, so that the body can maintain a certain buoyancy in seawater.

Jellyfish cells have a high water content, more than 90%, these water fissures are free water, they are not limited by the cell membrane, they can move freely, therefore, the water inside the jellyfish cells is free water. Free water refers to water that is not limited by membranes and can move freely, and it can participate in various physiological processes of cells, such as the regulation of osmotic pressure and the transportation of nutrients in cells.

The most abundant compounds. Water is the most abundant compound in living organisms or cells, and the vast majority of water in cells exists in a free form, i.e., free water.

Unicellular organisms are made up of only a single cell and often aggregate into colonies of cells.