Conclusion:

1. In terms of maximizing diffusion, the most effective size cube is the smallest cube:
2. The smallest size is the most effective at maximizing diffusion because the surface area to volume ratio is the largest. Imagine the cube is made of layers of substance covering one another. The rate at which the absorbed material goes through a layer is the same, regardless of the area (when the layers are completely exposed to the material). Therefore, the more layers the cube has, the less effective it is for diffusion. Apart from the surface area to volume ratio, some other important factors that affect the way materials diffuse into cells or tissues are the state of the materials (ions, molecular, big, small,…), the permeability of the cell membrane, the difference in the concentration of the solvent on the two sides of the cell membrane.
3. If the cell were to be very large, the surface area to volume ratio will decrease, which means it takes longer for the materials to diffuse throughout the cell. When the cell takes too much time to distribute the materials inside itself, it couldn’t function efficiently.
4. Between the three cubes with its surface area to volume ratio (A is 3:1, B is 5:2, C is 4:1), cube C is most effective at maximizing diffusion because its surface area to volume ratio is the greatest.
5. The alveoli in the lungs are small sacs at which oxygen is absorbed into the bloodstream and carbon dioxide is taken out of the bloodstream. The small size of the alveoli – large surface area to volume ratio – allows the gases to exchange at a fast rate.
6. Certain cells such as bacteria cannot get to be the size of the small fish because, with such a large size, a cell will need more energy to function, but the increase in the surface area to volume ration also means that it is more difficult for the cell to distribute the nutrients throughout itself. Thus, these cells don’t get to be the size of a small fish.
7. By being a multicellular, the cells in large organisms are able to keep their small size – a large surface area to volume ratio – which allows them to efficiently maximize diffusion. If large organisms were unicellular, the rate of diffusion would be very slow, leading to insufficient energy for the organisms to function properly.