( Stomata ( ( are ( openings ( in ( ( the epidermis ) ( that ( ( allow ( ( ( ( ( gas exchange ) -LRB- ) ( O 2 ) ) and ) ( ( H 2 ) O ) ) ) out ) ) ) ) ) ) ; ) )
(ROOT (S (NP (NNP Stomata)) (VP (VBP are) (NP (NP (NNS openings)) (PP (IN in) (NP (NP (DT the) (NNS epidermis)) (SBAR (WHNP (WDT that)) (S (VP (VBP allow) (NP (NP (NP (NN gas) (NN exchange)) (-LRB- -LRB-) (NP (NP (NNP O)) (NP (CD 2)))) (CC and) (NP (NP (NNP H) (CD 2)) (NP (NNP O)))) (PRT (RP out))))))))) (: ;)))
Stomata are openings in the epidermis that allow gas exchange (O 2 and H 2 O out;
(ROOT (S (NP (NP (DT The) (NNS epidermis)) (PP (IN of) (NP (DT a) (NN leaf)))) (VP (VBZ contains) (NP (NP (NNS openings)) (VP (VBN known) (PP (IN as) (NP (NP (NN stomata)) (, ,) (SBAR (WHPP (IN through) (WHNP (WDT which))) (S (NP (NP (DT the) (NN exchange)) (PP (IN of) (NP (NNS gases)))) (VP (VBZ takes) (NP (NN place)))))))))) (. .)))