They have sex every 5 minutes in which they share oxygen with each other, this allows them to reproduce and breathe at the same time.
The actual sites of gas exchange within the lungs are the alvioli.
The gas occurs by simple diffusion through the cells.
the alveolus
in the leave
gills
Jellyfish are, compared to mollusks, arthropods and vertebrates, very simple organisms. Jellyfish did not evolve a circulatory system, as they can perform gas exchange at their outer surfaces.
gas exchange occurs between the thin walls of the alveoli and the thin walls of the capillaries
in their gills.
In the alveoli
lungs
Gas exchange does not occur in the pleura. The pleura is a membrane that lines the outside of the lungs and inside of the chest cavity. Gas exchange, where oxygen is taken in and carbon dioxide is removed, happens in the alveoli of the lungs.
Capillaries