The four types are dffusion, osmosis, facililated diffuison, and active transport. Diffusion is when someone wears perfume and the aromatic molecules spread concentrating on that persons skin, the aroma disperses. Osmosis is when water moves through a semipermeable membrane from an area of higher concentration to an area of low concentration. Facilitated diffusion is a transport protein in the membrane enhances the transport of the substance across the membrane. Active transport uses energy in the form of ATP and materials flow against the concentration gradient.
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