( They ( ( ( ( ( ( rely ( on ( ( ( simple diffusion ) , ) ( ( the ( passive movement ) ) ( of materials ) ) ) ) ) ( from ( ( an area ) ( of ( high concentration ) ) ) ) ) ( to ( ( an area ) ( of ( low concentration ) ) ) ) ) , ) ( to ( ( ( move ( gases ( and ( waste materials ) ) ) ) ( ( in and ) out ) ) ( of ( the cell ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP rely) (PP (IN on) (NP (NP (JJ simple) (NN diffusion)) (, ,) (NP (NP (DT the) (JJ passive) (NN movement)) (PP (IN of) (NP (NNS materials)))))) (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 (JJ low) (NN concentration))))) (, ,) (S (VP (TO to) (VP (VB move) (NP (NNS gases) (CC and) (NN waste) (NNS materials)) (PRT (RP in) (CC and) (RP out)) (PP (IN of) (NP (DT the) (NN cell))))))) (. .)))
They rely on simple diffusion, the passive movement of materials from an area of high concentration to an area of low concentration, to move gases and waste materials in and out of the cell.
(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)))))))))) (. .)))