Diffusion:Gas exchanges in the lungs operate using diffusion. The Carbon Dioxide that is produced as a result of the oxygen is removed due to there being a higher concentration of carbon dioxide inside than outside.
Osmosis:
Dipping a sponge in water will cause the water to be absorbed since there is a higher concentration of water outside than in.
Facilitated Diffusion:Glucose cannot normally enter through the cell membrane due to the lipid bilayer, yet due to the protein in the membrane, it can enter.
Endocytosis:
Bacteria being engulfed by the cell by the cell membrane.
References:
http://answers.yahoo.com/question/index?qid=20081015141528AA5Xkb2
http://www.emc.maricopa.edu/faculty/farabee/biobk/biobooktransp.html
