( Duckweed ( ( ( ( ( can directly ) absorb ) and ) ( metabolize ( ( ( ( ( both ( complex carbohydrates ) ) ( such ( as ( sucrose ( , ( ( fructose and ) glucose ) ) ) ) ) ) , ) ( as ( well as ) ) ) ( ( organic ( nitrogenous compounds ) ) ( such ( as ( ( urea and ) ( most ( amino acids ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Duckweed)) (VP (VP (MD can) (ADVP (RB directly)) (VP (VB absorb))) (CC and) (VP (VBP metabolize) (NP (NP (NP (DT both) (JJ complex) (NNS carbohydrates)) (PP (JJ such) (IN as) (NP (NN sucrose) (, ,) (NN fructose) (CC and) (NN glucose)))) (, ,) (CONJP (RB as) (RB well) (IN as)) (NP (NP (JJ organic) (NNS nitrogenous) (NNS compounds)) (PP (JJ such) (IN as) (NP (NP (NN urea)) (CC and) (NP (RBS most) (JJ amino) (NNS acids)))))))) (. .)))
Duckweed can directly absorb and  metabolize both complex carbohydrates such as sucrose, fructose and glucose, as  well as organic nitrogenous compounds such as urea and most amino acids.
(ROOT (S (NP (NNS Carbohydrates)) (VP (VBP are) (NP (NP (DT the) (ADJP (RBS most) (JJ common)) (NN type)) (PP (IN of) (NP (JJ organic) (NN compound))))) (. .)))