( Diffusion ( ( is ( ( the ( net movement ) ) ( of ( ( ( ( a substance ) ( -LRB- ( ( ( liquid or ) gas ) -RRB- ) ) ) ( from ( ( an area ) ( of ( ( higher concentration ) ( to one ) ) ) ) ) ) ( of ( lower 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 (NN liquid)) (CC or) (NP (NN gas))) (-RRB- -RRB-))) (PP (IN from) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (NP (JJR higher) (NN concentration)) (PP (TO to) (NP (CD one))))))) (PP (IN of) (NP (JJR lower) (NN concentration))))))) (. .)))
Diffusion is the net movement of a substance (liquid or gas) from an area of higher concentration to one of lower concentration.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (DT the) (NN movement)) (PP (IN of) (NP (DT a) (NN substance)))) (PP (IN from) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (NP (DT a) (JJR higher) (NN amount)) (PP (IN toward) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (JJR lower) (NN amount) (NN diffusion)))))))))) (. .)))