Answer:
b. diffusion
Step-by-step explanation:
diffusion is the process by which process do oxygen and carbon dioxide Move between cells and capillaries.Diffusion is the movement of molecules from a region where they are more concentrated to one where they are less concentrated. Therefore, "Movement of molecules from a region of their greater concentration to a region of their lower concentration" is the right response. The definition of diffusion is the transfer of individual molecules of a material from a region of higher concentration to a region of lower concentration over a semipermeable barrier.