Diffusion is the net movement of molecules from an area where they are at a higher concentration to areas where they are at a lower concentration. This is due to the random movement of the molecules.

This is a preview. Log in through your library . Abstract (1) Seedlings of six species of thistle (Carduus nutans, C. `pycnocephalus', Carthamus lanatus, Cirsium vulgare, Onopordum aff. illyricum and ...