Which describes gas exchange in the respiratory system?
gas exchange happens through diffusion.
gas exchange removes oxygen from the body.
gas exchange occurs between the body’s cells and bronchi.
gas exchange protects the body against foreign invaders.

The actual answer is gas exchange happens through diffusion I just checked it

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the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

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