( ( The skin ) ( ( contains ( ( an ( extensive ( vascular network ) ) ) ( of ( capillaries ( which ( ( allow ( for ( gas exchange ) ) ) ( to ( ( ( take place ) just ) ( below ( the epidermis ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN skin)) (VP (VBZ contains) (NP (NP (DT an) (JJ extensive) (NN vascular) (NN network)) (PP (IN of) (NP (NP (NNS capillaries)) (SBAR (WHNP (WDT which)) (S (VP (VBP allow) (PP (IN for) (NP (NN gas) (NN exchange))) (S (VP (TO to) (VP (VB take) (NP (NN place)) (ADVP (RB just)) (PP (IN below) (NP (DT the) (NNS epidermis))))))))))))) (. .)))
The skin contains an extensive vascular network of capillaries which allow for gas exchange to take place just below the epidermis.
(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)))))))))) (. .)))