( ( ( Humans : ) ( ( ( digestion and ) absorption ) ( of carbohydrate ) ) ) . )
(ROOT (NP (NP (NNS Humans)) (: :) (NP (NP (NN digestion) (CC and) (NN absorption)) (PP (IN of) (NP (NN carbohydrate)))) (. .)))
Humans: digestion and absorption of carbohydrate.
(ROOT (S (NP (NP (DT The) (JJ main) (NN function)) (PP (IN of) (NP (DT the) (JJ human) (NN digestive) (NN system)))) (VP (VBZ is) (S (VP (TO to) (VP (VB break) (PRT (RP down)) (NP (NP (NNS foods)) (PP (IN for) (NP (NN absorption)))) (PP (IN into) (NP (DT the) (NN blood))))))) (. .)))