Is it true that over 95 percent of a jellyfish is water?

Yes, it is true that over 95 percent of a jellyfish is water. A jellyfish is plankton in water; its body has no complex organs like a heart, bones, blood, or gills, and is over 98 percent water, so it looks transparent like a clear umbrella and is a very pretty aquatic animal.

A jellyfish’s body has two germ layers with a thick jelly layer between them; the inner layer is a simple body cavity lined with stomach skin, with only one opening that serves both for eating and excreting.