( Substances ( ( ( can also ) ( move ( through ( ( the cell ) ( ( ( ( ( ( membrane ( by ( active transport ) ) ) , ) ( thus ( requiring energy ) ) ) , ) ( moving ( from low ) ) ) ( to ( high concentration ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Substances)) (VP (MD can) (ADVP (RB also)) (VP (VB move) (PP (IN through) (S (NP (DT the) (NN cell)) (VP (VP (VBG membrane) (PP (IN by) (NP (JJ active) (NN transport)))) (, ,) (VP (ADVP (RB thus)) (VBG requiring) (NP (NN energy))) (, ,) (VP (VBG moving) (PP (IN from) (ADJP (JJ low)))) (PP (TO to) (NP (JJ high) (NN concentration)))))))) (. .)))
Substances can also move through the cell membrane by active transport, thus requiring energy, moving from low to high concentration.
(ROOT (S (NP (NNP Passive) (NN transport)) (VP (VP (VBZ requires) (NP (DT no) (NN energy))) (CC and) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (NNS substances)) (VP (VBP move) (PP (IN from) (NP (NP (NNS areas)) (PP (IN of) (NP (NP (JJR higher)) (PP (TO to) (NP (JJR lower) (NN concentration)))))))))))) (. .)))