( ( The organism ) ( ( ( ( ( lives ( inside ( small ( intestinal cells ) ) ) ) , ) mainly ) ( in ( the ( small intestine ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN organism)) (VP (VBZ lives) (PP (IN inside) (NP (JJ small) (JJ intestinal) (NNS cells))) (, ,) (ADVP (RB mainly)) (PP (IN in) (NP (DT the) (JJ small) (NN intestine)))) (. .)))
The organism lives inside small intestinal cells, mainly in the small intestine.
(ROOT (S (PP (IN In) (NP (DT the) (NN body))) (, ,) (NP (NN chemical) (NN digestion)) (ADVP (RB mainly)) (VP (VBZ takes) (NP (NP (NN place)) (PP (IN in) (NP (DT the) (JJ small) (NN intestine))))) (. .)))
In the body, chemical digestion mainly takes place in the small intestine.