which is the process by which gas exchange between the respiratory system and the blood cells in the…

Brief Explanations:

Gas exchange between the respiratory system and blood - cells in capillaries occurs through diffusion. Diffusion is the movement of substances from an area of high concentration to an area of low concentration. In the lungs, oxygen diffuses from the alveoli (high - oxygen area) into the capillaries (low - oxygen area), and carbon dioxide diffuses from the capillaries (high - carbon dioxide area) into the alveoli (low - carbon dioxide area). Transfusion is the transfer of blood or blood components. Condensation is the change of a gas to a liquid. Evaporation is the change of a liquid to a gas.

Answer:

D. diffusion