( Diffusion ( ( occurs ( according ( to ( ( ( a ( concentration gradient ) ) , ) ( that ( ( is , ) ( ( a solute ) ( will ( ( ( move ( from ( areas ( of ( ( high concentration ) ( -LRB- ( hypertonic -RRB- ) ) ) ) ) ) ) ( to ( areas ( of ( ( low concentration ) ( -LRB- ( hypotonic -RRB- ) ) ) ) ) ) ) ( until ( ( the concentration ) ( ( is equal ) ( -LRB- ( isotonic -RRB- ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Diffusion)) (VP (VBZ occurs) (PP (VBG according) (PP (TO to) (NP (NP (DT a) (NN concentration) (NN gradient)) (, ,) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (, ,) (SBAR (S (NP (DT a) (NN solute)) (VP (MD will) (VP (VB move) (PP (IN from) (NP (NP (NNS areas)) (PP (IN of) (NP (NP (JJ high) (NN concentration)) (PRN (-LRB- -LRB-) (ADJP (JJ hypertonic)) (-RRB- -RRB-)))))) (PP (TO to) (NP (NP (NNS areas)) (PP (IN of) (NP (NP (JJ low) (NN concentration)) (PRN (-LRB- -LRB-) (ADJP (JJ hypotonic)) (-RRB- -RRB-)))))) (SBAR (IN until) (S (NP (DT the) (NN concentration)) (VP (VBZ is) (ADJP (JJ equal)) (PRN (-LRB- -LRB-) (ADJP (JJ isotonic)) (-RRB- -RRB-)))))))))))))))) (. .)))
Diffusion occurs according to a concentration gradient, that is, a solute will move from areas of high concentration (hypertonic) to areas of low concentration (hypotonic) until the concentration is equal (isotonic).
(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))))))))))))))) (. .)))