Why can't you live without diffusion?

Answer 1

Various molecules have to get from where they are to where they are needed and can be used. Diffusion is just a random movement of molecules. Oxygen is not PUT into the blood cells, for example. It is brought into a close enough proximity to the red blood cells that DIFFUSION is likely to bring it close enough to be captured by the cells to be carried to the other cells. There, it will be released and DIFFUSE to the cells and be used (by the mitochondria) to complete the necessary oxidative processes.

Answer 2

Diffusion is essential for various biological processes such as nutrient uptake and waste removal in living organisms. Without diffusion, cells would not be able to exchange necessary molecules with their environment, leading to an inability to function properly. This would ultimately result in cell death and the inability to sustain life.