( Diffusion ( ( is ( ( the ( net movement ) ) ( of ( ( ( a substance ) ( -LRB- ( ( ( e.g. , ) ( an ( atom ( , ( ( ion or ) molecule ) ) ) ) ) -RRB- ) ) ) ( from ( ( a region ) ( of ( ( high concentration ) ( to ( ( a region ) ( of ( low concentration ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Diffusion)) (VP (VBZ is) (NP (NP (DT the) (JJ net) (NN movement)) (PP (IN of) (NP (NP (NP (DT a) (NN substance)) (PRN (-LRB- -LRB-) (NP (NP (NNP e.g.)) (, ,) (NP (DT an) (NN atom) (, ,) (NN ion) (CC or) (NN molecule))) (-RRB- -RRB-))) (PP (IN from) (NP (NP (DT a) (NN region)) (PP (IN of) (NP (NP (JJ high) (NN concentration)) (PP (TO to) (NP (NP (DT a) (NN region)) (PP (IN of) (NP (JJ low) (NN concentration))))))))))))) (. .)))
Diffusion is the net movement of a substance (e.g., an atom, ion or molecule) from a region of high concentration to a region of low concentration.
(ROOT (S (NP (NNP Diffusion)) (VP (VBZ is) (NP (NP (DT the) (NN process)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (DT a) (NN substance)) (ADVP (RB naturally)) (VP (VBZ moves) (PP (IN from) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (NP (JJR higher)) (PP (TO to) (NP (JJR lower) (NN concentration)))))))))))) (. .)))
Diffusion is the process in which a substance naturally moves from an area of higher to lower concentration.