The gas occurs by simple diffusion through the cells.
the alveolus
in the leave
gills
gas exchange occurs between the thin walls of the alveoli and the thin walls of the capillaries
in their gills.
lungs
In the alveoli
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
Between the avioli and the lungs.
It's a pore found in the epidermis of the leaf and stem of a plant, used for gas exchange.