( ( My hypothesis ) ( ( states ( that ( ( both ( ( ( the ( Sugar Maple ) ) and ) ( the ( Rubber Tree ) ) ) ) ( normally ( ( ( ( heal damage ) ( to ( their ( outer bark ) ) ) ) and ) ( sapwood ( by ( ( filling ( the wound ) ) ( with ( ( ( ( resin ( from ( the ( inside out ) ) ) ) and ) then ) ( ( the ( new growth ) ) ( of ( ( ( the sapwood ) and ) ( the ( outer bark ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP$ My) (NNS hypothesis)) (VP (VBZ states) (SBAR (IN that) (S (NP (CC both) (NP (DT the) (NNP Sugar) (NNP Maple)) (CC and) (NP (DT the) (NNP Rubber) (NNP Tree))) (ADVP (RB normally)) (VP (VP (VB heal) (NP (NN damage)) (PP (TO to) (NP (PRP$ their) (JJ outer) (NN bark)))) (CC and) (VP (VBN sapwood) (PP (IN by) (S (VP (VBG filling) (NP (DT the) (NN wound)) (PP (IN with) (NP (NP (NP (NN resin)) (PP (IN from) (NP (DT the) (JJ inside) (NN out)))) (CC and) (ADVP (RB then)) (NP (NP (DT the) (JJ new) (NN growth)) (PP (IN of) (NP (NP (DT the) (NN sapwood)) (CC and) (NP (DT the) (JJ outer) (NN bark))))))))))))))) (. .)))
My hypothesis states that both the Sugar Maple and the Rubber Tree normally heal damage to their outer bark and sapwood by filling the wound with resin from the inside out and then the new growth of the sapwood and the outer bark.
(ROOT (S (NP (NP (DT The) (JJS newest)) (, ,) (NP (NP (JJ outer) (NNS layers)) (PP (IN of) (NP (JJ secondary) (NN xylem))))) (VP (VBP are) (VP (VBN called) (S (ADJP (JJ sapwood))))) (. .)))