( Diffusion ( ( is ( movement ( of ( molecules ( along ( ( a concentration ) ( ( gradient ( from ( ( an area ) ( of ( high concentration ) ) ) ) ) ( to ( ( an area ) ( of ( lower concentration ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Diffusion)) (VP (VBZ is) (NP (NP (NN movement)) (PP (IN of) (NP (NP (NNS molecules)) (PP (IN along) (NP (NP (DT a) (NN concentration)) (VP (VBN gradient) (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 is movement of molecules along a concentration gradient from an area of high concentration to an area 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)))))))))) (. .)))