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define diffusion
diffusion is the net movement particles from a region of higher concentration to a region of lower concentration down a concentration gradient
concentration gradient
is the difference in concentration between two regions
osmosis
is the net movement of water molecules from a region of high water potential to a region of lower water potential, through a partially permeable membrane
hypertonic and hypotonic
hyper: low water potential
hypo: high water potential
active transport
is the process in which energy is used to move the particles of a substance across a membrane against its concentration gradient, from a region of lower concentration to a region of higher concentration
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