which of a-d below is an example of diffusion, osmosis, or neither? Explain your answer in each case. a Water moves from a dilute solution in the soil into the cells in a plant's roots. b Saliva flows out of the salivary glands into your mouth. c spot of blue ink dropped into a glass of still water quickly colours all the water blue. d Carbon dioxide goes into a plant's leaves when it is photosynthesising.​