( ( Describe ( how ( ( ( ( ( the process ) ( of diffusion ) ) or ) ( ( the movement ) ( of ( molecules ( from ( ( an area ) ( of ( ( high concentration ) ( to ( ( an area ) ( of ( low concentration ) ) ) ) ) ) ) ) ) ) ) ) ( ( -LRB- ( ( down ( the ( concentration gradient ) ) ) -RRB- ) ) ( occurs ( because ( of ( molecular collisions ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Describe) (SBAR (WHADVP (WRB how)) (S (NP (NP (NP (DT the) (NN process)) (PP (IN of) (NP (NN diffusion)))) (CC or) (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))))))))))))) (PRN (-LRB- -LRB-) (PP (IN down) (NP (DT the) (NN concentration) (NN gradient))) (-RRB- -RRB-)) (VP (VBZ occurs) (PP (RB because) (IN of) (NP (JJ molecular) (NNS collisions))))))) (. .)))
Describe how the process of diffusion or the movement of molecules from an area of high concentration to an area of low concentration (down the concentration gradient) occurs because of molecular collisions.
(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)))))))))) (. .)))