Diffusion occurs because of the movement of molecules from the region of higher concentration to the region of lower concentration. This movement of molecules occurs due to a thermal motion. Diffusion normally occurs between two compartments having difference in concentration. In case of fluid it moves from the region of higher concentration to the region of concentration until a balance is reached. The process of diffusion is very important for the humans as well. The oxygen that humans breathe in gets diffused with the blood.<span><span> </span>
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That would be the tuber, which is formed from a root or stem of a plant.
The immune system is made up of cells, tissues, proteins, chemicals, and organs that work together. The immune system is a bodys defense against infectious organisms and other invadors
It's B! Hope this helped let me know if it was! (: