The moon jellyfish (Aurelia aurita) is a multicellular marine organism with a simple body plan consisting of two thin epithelial layers enclosing a non-living, jelly-like mesoglea. It lacks specialized respiratory organs, meaning gas exchange occurs directly across its body surface.
Identify the gases that are exchanged across the outer epithelial layer of the jellyfish as a result of aerobic respiration, and describe their net direction of movement relative to the organism.