Breathe jellyfish If so, how

What kind of strange creatures are they that remind us more of jelly than an animal?
Their umbrella-shaped body consists almost entirely of water and some jellyfish are almost transparent so that we can see inside their bodies. But there isn't much to see there! Not the slightest trace of gills like fish, a windpipe, or a heart. Then how can these animals breathe?
Most animals take in oxygen through their lungs, and from there it goes directly into the blood. The heart pumps the blood to all parts of the body so that the cells are supplied with the oxygen that is essential for life.
To understand how jellyfish breathe, you have to take a closer look at their physique: They consist of a very thin outer skin and an equally thin inner skin. Between these skins there is a jelly-like layer in which there are only a few cells. You can think of it as two plastic bags stuck inside each other. Because both skins only consist of a single layer of cells, the oxygen dissolved in the water can be absorbed directly by the cells. The cells need the oxygen because it provides some of the energy necessary for the jellyfish to move and grow. In Asia there is a species of jellyfish that is 10 m can reach and about 200 kg weighs!
So jellyfish are very simply built, but still capable of amazing performance.