( ( Mechanical ( and ( chemical digestion ) ) ) ( ( ( begin ( in ( the mouth ) ) ) ( where ( food ( ( is ( ( ( chewed , ) and ) ( mixed ( with saliva ) ) ) ) ( to ( begin ( ( enzymatic processing ) ( of starches ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Mechanical) (CC and) (NN chemical) (NNS digestion)) (VP (VBP begin) (PP (IN in) (NP (DT the) (NN mouth))) (SBAR (WHADVP (WRB where)) (S (NP (NN food)) (VP (VBZ is) (ADJP (ADJP (JJ chewed)) (, ,) (CC and) (ADJP (JJ mixed) (PP (IN with) (NP (NN saliva))))) (S (VP (TO to) (VP (VB begin) (NP (NP (JJ enzymatic) (NN processing)) (PP (IN of) (NP (NNS starches))))))))))) (. .)))
Mechanical and chemical digestion begin in the mouth where food is chewed, and mixed with saliva to begin enzymatic processing of starches.
(ROOT (S (NP (NNP Digestion)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN mouth)))) (. .)))