( ( ( ( Diffusion movement ) ( of ( ( a substance ) ( from ( ( an area ) ( of ( high concentration ) ) ) ) ) ) ) ( to ( ( an area ) ( of ( lower concentration ) ) ) ) ) . )
(ROOT (NP (NP (NN Diffusion) (NN movement)) (PP (IN of) (NP (NP (DT a) (NN substance)) (PP (IN from) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (JJ high) (NN concentration))))))) (PP (TO to) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (JJR lower) (NN concentration))))) (. .)))
Diffusion movement of a substance from an area of high concentration to an area of lower 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.