( Diffusion ( ( is ( ( the movement ) ( of ( ( a substance ) ( from ( ( an area ) ( of ( ( greater concentration ) ( to ( ( an area ) ( of ( lesser concentration ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Diffusion)) (VP (VBZ is) (NP (NP (DT the) (NN movement)) (PP (IN of) (NP (NP (DT a) (NN substance)) (PP (IN from) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (NP (JJR greater) (NN concentration)) (PP (TO to) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (JJR lesser) (NN concentration))))))))))))) (. .)))
Diffusion is the movement of a substance from an area of greater concentration to an area of lesser concentration.
(ROOT (S (NP (NNP Diffusion)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (DT the) (NN movement)) (PP (IN of) (NP (NP (NNS molecules)) (PP (IN from) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (NP (JJ high) (NN concentration)) (PP (TO to) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (JJ low) (NN concentration))))))))))))))) (. .)))