Final answer:
Simple diffusion is the process by which gases like O2 and CO2 move through a membrane without requiring energy input or carrier molecules.
Explanation:
Simple diffusion is the transport process by which gases like O2 and CO2 move through a membrane without the need for energy input or carrier molecules. These small molecules can freely cross the hydrophobic phospholipid barrier within the membrane bilayer. This process plays a crucial role in gas exchange during respiration.
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